WASHINGTON, DC - APRIL 27: Using teleprompters, Republican presidential candidate Donald Trump delivers a speech about his vision for foreign policy at the Mayflower Hotel April 27, 2016 in Washington, DC. A real estate billionaire and reality television star, Trump beat his GOP challengers by double digits in Tuesday's presidential primaries in Pennsylvania, Maryland, Deleware, Rhode Island and Connecticut. 'I consider myself the presumptive nominee, absolutely,' Trump told supporters at the Trump Tower following yesterday's wins. (Photo by Chip Somodevilla/Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks during a campaign event in Pittsburgh, Pennsylvania, U.S., on Monday, April 25, 2016. Sanders said he's lost Democratic presidential nominating contests to Hillary Clinton in states with high levels of income inequality, an issue he's centered his campaign on, because not enough low-income people go to the polls. Photographer: Pete Marovich/Bloomberg via Getty Images
