Donald Trump

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Chris Christie, left, and Donald Trump talk during a break in the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

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Former GOP presidential candidate Mitt Romney said front-runner Donald Trump should turn over his tax returns, and made reference to a "bombshell" awaiting therein. Mr. Trump endorsed Mr. Romney in 2012. (Associated Press) ** FILE **

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FILE - In this Jan. 13, 2016 file photo, Republican presidential candidate Donald Trump speaks during a campaign rally at the Pensacola Bay Center in Pensacola Fla. Trump is a part-time Florida resident - and a full-time problem for its home-state senator, Marco Rubio. Rubio is counting on Florida to reshape the Republican presidential contest that Trump has so far dominated by winning three of the first four states to vote. (AP Photo/Michael Snyder, File) **FILE**

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A grinning Donald Trump appears ready for Super Tuesday, and visits seven states in the next 72 hours. (Donald trump)

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A grinning Donald Trump appears ready for Super Tuesday, and visits seven states in the next 72 hours. (Donald. J. Trump)

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Pollsters say Republican presidential candidate Donald Trump isn't likely to pick up Jeb Bush's former supporters and no clear consensus on Plan B. (Associated Press)

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Illustration on the impact of Donald Trump on the GOP by Linas Garsys/The Washington Times

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Republican presidential candidate Donald Trump greets supporters during a rally Tuesday, Feb. 23, 2016, in Reno, Nev. (AP Photo/Marcio Jose Sanchez)

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Republican presidential candidate Donald Trump reacts as he walks up to the stage during a rally Tuesday, Feb. 23, 2016, in Reno, Nev. (AP Photo/Marcio Jose Sanchez)

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GOP frontrunner Donald Trump has made statements that might bring down a lesser campaign. How well do you remember what he actually said?

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Illustration on Donald Trump's appeal by Alexander Hunter/The Washington Times

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Republican presidential candidate Donald Trump speaks during a South Carolina Republican primary night event, Saturday, Feb. 20, 2016 in Spartanburg, S.C. (AP Photo/Paul Sancya)

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Republican presidential candidate Donald Trump speaks during a campaign stop Friday, Feb. 19, 2016, in North Charleston, S.C. (AP Photo/Matt Rourke)

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Republican presidential candidate Donald Trump speaks speaks with members of the media as he meets with attendees during a campaign stop, Friday, Feb. 19, 2016, in Myrtle Beach, S.C. (AP Photo/Matt Rourke)

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Republican presidential candidate Donald Trump speaks speaks with members of the media as he meets with attendees during a campaign stop, Friday, Feb. 19, 2016, in Myrtle Beach, S.C. (AP Photo/Matt Rourke)