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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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    Donald Trump on the defensive over his past

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Donald Trump on the defensive over his past

Presumptive Republican nominee Donald Trump is speaking up on his own behalf over allegations about his past. CNN's Phil Mattingly reports.

Donald Trump on the defensive over his past

Presumptive Republican nominee Donald Trump is speaking up on his own behalf over allegations about his past. CNN's Phil Mattingly reports.