House Speaker Paul Ryan Holds Weekly News Conference [Getty Images]

U.S. House Speaker Paul Ryan, a Republican from Wisconsin, speaks during a news conference in Washington, D.C., U.S., on Thursday, May 26, 2016. Donald Trump and Ryan spoke by telephone on Wednesday night, as the pair of Republican leaders try to break a weeks-long impasse over an endorsement. Photographer: Andrew Harrer/Bloomberg via Getty Images

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