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Pro-EU membership supporters hold EU flags on the first day of Gina Miller's, a founder of investment management group SCM Private, lawsuit at the High Court, in London, Thursday, Oct. 13, 2016. The financial entrepreneur's landmark lawsuit begins with a simple question: can Prime Minister Theresa MayâÄ™s government invoke Article 50 and trigger Britain's exit from the European Union without an act of Parliament? (AP Photo/Alastair Grant)