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Paul Manafort, campaign worker for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, speaks with the press during an election night event in New York, U.S., on Tuesday, April 19, 2016. Trump, the billionaire real-estate mogul, got a major boost in his quest to secure the Republican nomination with a majority of delegates but could not eliminate the possibility of a contested convention. Photographer: Victor J. Blue/Bloomberg via Getty Images

Paul Manafort, campaign worker for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, speaks with the press during an election night event in New York, U.S., on Tuesday, April 19, 2016. Trump, the billionaire real-estate mogul, got a major boost in his quest to secure the Republican nomination with a majority of delegates but could not eliminate the possibility of a contested convention. Photographer: Victor J. Blue/Bloomberg via Getty Images