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Republican presidential candidate Donald Trump waves as he arrives for a meeting with House Speaker Paul Ryan of Wis., at the Republican National Committee Headquarters on Capitol Hill in Washington, Thursday, May 12, 2016. Trump and Ryan are sitting down face-to-face for the first time, a week after Ryan stunned Republicans by refusing to back the mercurial billionaire for president.  (AP Photo/Andrew Harnik)
Republican presidential candidate Donald Trump waves as he arrives for a meeting with House Speaker Paul Ryan of Wis., at the Republican National Committee Headquarters on Capitol Hill in Washington, Thursday, May 12, 2016. Trump and Ryan are sitting down face-to-face for the first time, a week after Ryan stunned Republicans by refusing to back the mercurial billionaire for president.  (AP Photo/Andrew Harnik)

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Unifying the Republican party and questions about "John Miller" --how will Donald Trump tackle new speed bumps as the presumptive nominee.