Donald Trump

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Donald Trump is fighting to keep his place at the top of the polls in New Hampshire. This week, he laid into New Jersey Gov. Chris Christie for embracing President Obama in 2012 in the aftermath of Superstorm Sandy. (Associated Press)

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Republican presidential candidate, businessman Donald Trump addresses supporters at a campaign rally, Monday, Dec. 21, 2015, in Grand Rapids, Mich. (AP Photo/Carlos Osorio)

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Republican presidential candidate Donald Trump addresses supporters at a campaign rally, Monday, Dec. 21, 2015, in Grand Rapids, Mich. (AP Photo/Carlos Osorio)

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Republican presidential candidate Donald Trump poses with supporters after a campaign rally, Monday, Dec. 21, 2015, in Grand Rapids, Mich. (AP Photo/Carlos Osorio)

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Republican presidential candidate, businessman Donald Trump addresses supporters at a campaign rally, Monday, Dec. 21, 2015, in Grand Rapids, Mich. (AP Photo/Carlos Osorio)

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Republican presidential candidate, businessman Donald Trump addresses supporters at a campaign rally, Monday, Dec. 21, 2015, in Grand Rapids, Mich. (AP Photo/Carlos Osorio)

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Republican presidential candidate, businessman Donald Trump addresses supporters at a campaign rally, Monday, Dec. 21, 2015, in Grand Rapids, Mich. (AP Photo/Carlos Osorio)

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Donald Trump has been a target for Democrats' attacks throughout the campaign. But the attacks have grown sharper as he defied predictions that his unconventional campaign would flare out and remained atop most polls. (Associated Press)

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Immigration issues have been the lifeblood of Donald Trump's campaign, including his pledges to build a wall across the southern border, deport illegal immigrants and temporarily bar Muslim visitors from entering the country.

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Republican presidential candidate Donald Trump at the National Federation of Republican Assemblies in Nashville, Tenn. (Associated Press) **FILE**

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Democratic presidential candidate Hillary Clinton speaks about recent comments from Republican presidential candidate Donald Trump during a campaign stop Tuesday, Dec. 8, 2015, in Salem, N.H. (AP Photo/Jim Cole)

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Democratic presidential candidate Hillary Clinton speaks about recent comments from Republican presidential candidate Donald Trump during a campaign stop Tuesday, Dec. 8, 2015, in Salem, N.H. (AP Photo/Jim Cole) ** FILE **

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Donald Trump Illustration by Linas Garsys/The Washington Times

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Democratic presidential candidate Hillary Clinton speaks about recent comments from Republican presidential candidate Donald Trump during a campaign stop Tuesday, Dec. 8, 2015, in Salem, N.H. (AP Photo/Jim Cole)

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Republican presidential candidate, businessman Donald Trump, speaks during a rally coinciding with Pearl Harbor Day at Patriots Point aboard the aircraft carrier USS Yorktown in Mt. Pleasant, S.C., Monday, Dec. 7, 2015. Trump defended his plan, Tuesday, Dec. 8, 2015, for a "total and complete shutdown of Muslims entering the United States" by comparing it with President Franklin Roosevelt's decision to inter Japanese Americans during World War II. (AP Photo/Mic Smith)

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In this Sept. 24, 2015, file photo, Republican presidential candidate Donald Trump waves to the crowd gathered in front of Trump Tower ahead of the arrival of the pope's motorcade for an appearance in New York's Central Park. Trump holds a trademark to use the words “Central Park” on items including furniture, chandeliers and even key chains. Records show his first application came in 1991, when the city’s crime rate was near its height and the park had a less-than-glamorous reputation. (AP Photo/Kevin Hagen, File)