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Scottish Referendum Independence Debate campaign poster as Saltire flag urging voters to give a YES vote for a separate nation for Scotland, Staffin, Scotland, United Kingdom, Europe . (KEYSTONE/ROBERT HARDING/Tim Graham)

SCHWEIZ REFERENDUM ORGANSPENDE

Alex Frei vom Referendumskomitee, aeussert sich zum Nein zur Organspende ohne explizite Zustimmung, am Donnerstag, 20. Januar 2021, in Bern. (KEYSTONE/Peter Schneider)

SPANIEN KATALONIEN KRISE

epa07112814 Catalan President Quim Torra smiles during the regional Cabinet meeting held in Barcelona, northeastern Spain, 23 October 2018. The session comes one day after Torra met in Waterloo with the fled former Catalan President Carles Puigdemont and representatives of the Catalan pro-independence forces, except for the CUP party, and announced a new 'Consell de la Republica' (lit: Council of the Republic). Based in Brussels and chaired by Puigdemont, the new body will arrange political actions to be later driven by the Catalan Government. The 'Consell de la Republica' will be presented on the upcoming 30 September, three days following the establishment of Puigdemont's new pro-independence party 'Crida Nacional per la Republica'. EPA/ANDREU DALMAU

SPANIEN KATALONIEN KRISE

epa07083339 Former Catalan regional President Artur Mas (C) speaks to the media after leaving the Spanish Court of Auditors in Madrid, Spain, 10 October 2018. The Spanish Court of Auditors starts the trial against former Catalan president Artur Mas and three former regional ministers for the 9N illegal non binding referendum held back on 09 November 2014. Over 2.2 million people voted from a total of 5.4 million voters from which over 1.8 million chose an independent state. The referendum was held despite a ruling by Spanish Constitutional Court that warned that its celebration would be illegal. The Court of Auditors will now rule whether or not the accused used public money to hold the non binding referendum. EPA/Mariscal

SPANIEN KATALONIEN KRISE

epa07071827 Catalan President, Quim Torra (R), and Vice President Pere Aragones (L), offer a press conference at the end of their meeting held in Barcelona, northeastern Spain, 05 October 2018. Their meeting comes one day after a General Politics debate at the Catalan Parliament celebrated amid tensions between Junts per Catalunya (JxCat) party and Esquerra Republicana de Catalunya (ERC) due to the delegate vote of the four MPs suspended by the Spanish High Court, Carles Puigdemont, Jordi Sanchez, Jordi Turull and Josep Rull. EPA/TONI ALBIR

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern mit Nationalrat Franz Grueter, links, reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern mit Nationalrat Franz Grueter, mitte rechts, und Kantonsraetin Angela Leuthold, mitte links, reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern mit Nationalrat Franz Grueter, mitte rechts, und Kantonsraetin Angela Leuthold, mitte links, reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern mit Nationalrat Franz Grueter, mitte rechts, und Kantonsraetin Angela Leuthold, mitte links, reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern mit Nationalrat Franz Grueter, mitte rechts, und Kantonsraetin Angela Leuthold, mitte links, reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern mit Nationalrat Franz Grueter, 2. von links, reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

SCHWEIZ LUZERN SVP REFERENDUM

Die SVP des Kanton Luzern mit Kantonsraetin Angela Leuthold, mitte links, reicht am Dienstag 14. Februar 2017 rund 4002 Unterschriften mit dem Referendum gegen eine erneute Steuererhoehung im Regierungsgebaeude in Luzern ein. (KEYSTONE/Urs Flueeler)

ITALIEN VERFASSUNG REFERENDUM

Former president Giorgio Napolitano votes in Rome for the referendum on constitutional reforms on December 4, 2016 (KEYSTONE/CAMERA PRESS/Donatella Giagnori)

ITALIEN VERFASSUNG REFERENDUM

Former president Giorgio Napolitano votes in Rome for the referendum on constitutional reforms on December 4, 2016 (KEYSTONE/CAMERA PRESS/Donatella Giagnori)

ITALIEN VERFASSUNG REFERENDUM

Former president Giorgio Napolitano votes in Rome for the referendum on constitutional reforms on December 4, 2016 (KEYSTONE/CAMERA PRESS/Donatella Giagnori)

GROSSBRITANNIEN EU REFERENDUM BREXIT

The viewing screen on a television camera shows the door of 10 Downing Street in London, Monday, June 27, 2016. Political turmoil has roiled Britain since the European Union referendum result to leave, as leaders of the government and opposition parties grapple with the question of how precisely the U.K. will separate from the other 27 nations in the bloc. (AP Photo/Matt Dunham)

GROSSBRITANNIEN EU REFERENDUM BREXIT

epa05387119 British Prime Minister David Cameron, next to his wife Samantha (R), announces his resignation after losing the vote in the EU Referendum outside No. 10 Downing Street in London, Britain, 24 June 2016. Britons in a referendum on 23 June have voted by a narrow margin to leave the European Union (EU). Media reports on early 24 June indicate that 51.9 per cent voted in favour of leaving the EU while 48.1 per cent voted for remaining in. EPA/FACUNDO ARRIZABALAGA

POLAND PUBLIC TRANSPORTATION

People get into the No.10 tram on Marszalkowska Street in Warsaw, Poland, 1947. PAP..***EXACT DATE UKNOWN*** POLAND OUT (KEYSTONE/PAP/PAP)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy-Istanbul to protest the results of the constitutional referendum one day after the polling day. Turkish president Erdogan's "Yes" campaign won with 51 % amid dispute over ballots. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy-Istanbul to protest the results of the constitutional referendum one day after the polling day. Turkish president Erdogan's "Yes" campaign won with 51 % amid dispute over ballots. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy-Istanbul to protest the results of the constitutional referendum one day after the polling day. Turkish president Erdogan's "Yes" campaign won with 51 % amid dispute over ballots. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy-Istanbul to protest the results of the constitutional referendum one day after the polling day. Turkish president Erdogan's "Yes" campaign won with 51 % amid dispute over ballots. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy-Istanbul to protest the results of the constitutional referendum one day after the polling day. Turkish president Erdogan's "Yes" campaign won with 51 % amid dispute over ballots. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy-Istanbul to protest the results of the constitutional referendum one day after the polling day. Turkish president Erdogan's "Yes" campaign won with 51 % amid dispute over ballots. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate the referendum's results in Kisilkli, close Recep Tayyip Erdogan's house. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy to protest the results of the constitutional referendum in Turkey. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy to protest the results of the constitutional referendum in Turkey. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy to protest the results of the constitutional referendum in Turkey. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy to protest the results of the constitutional referendum in Turkey. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy to protest the results of the constitutional referendum in Turkey. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

Hundreds of people gathered in Kadikoy to protest the results of the constitutional referendum in Turkey. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Haydar Tastan)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Mehmet Kacmaz)

TUERKEI ABSTIMMUNG VERFASSUNGSREFORM

AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Erhan Arik)