Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, center left, greets Carl Icahn, billionaire activist investor, center right, as he arrives at 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