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epa06123819 (FILE) - Former Federal Bureau of Investigation (FBI) Director Robert Mueller looks on as he appears before the Senate Judiciary Committee oversight hearing on the FBI, on Capitol Hill in Washington DC, USA, 14 December 2011 (reissued 04 August 2017). According to media reports on 03 August 2017, Special Counsel Robert Mueller, who is overseeing the investigation of possible Russian interference in the 2016 US presidential elections, has reportedly empaneled a grand jury as part of an expanding investigation looking into a probable collusion between US President Donald Trump's associates and the Kremlin. US media reports suggested that the move would take the probe into the first step towards possible criminal charges. EPA/MICHAEL REYNOLDS