Donald Trump

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Republican presidential candidate Donald Trump speaks during a rally at Clemson University Wednesday, Feb. 10, 2016, in Pendleton, S.C. (AP Photo/John Bazemore)

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Republican presidential candidate, businessman Donald Trump takes the stage to speak to supporters during a primary night rally, Tuesday, Feb. 9, 2016, in Manchester, N.H. (AP Photo/David Goldman)

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Republican presidential candidate, businessman Donald Trump gives thumbs up to supporters during a primary night rally, Tuesday, Feb. 9, 2016, in Manchester, N.H. (AP Photo/David Goldman)

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Supporters wait for Republican presidential candidate, businessman Donald Trump to speak during a primary night rally, Tuesday, Feb. 9, 2016, in Manchester, N.H. (AP Photo/Bill Sikes)

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Republican presidential candidate Donald Trump talks with diners while visiting the Chez Vachon restaurant Sunday, Feb. 7, 2016, in Manchester, N.H. (AP Photo/David Goldman)

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Republican presidential candidate Donald Trump speaks during a town hall campaign event at the Londonderry Lions Club Monday, Feb. 8, 2016, in Londonderry, N.H. (AP Photo/David Goldman)

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Republican presidential candidate Donald Trump gestures as he speaks at a campaign rally Friday, Feb. 5, 2016, in Florence, S.C. (AP Photo/John Bazemore)

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Ohio Gov. John Kasich has garnered support from many Republican voters in New Hampshire, but one of them noted that Donald Trump "has taken all the oxygen out of the room."

Republican presidential candidate, Sen. Marco Rubio, R-Fla., answers a question as Republican presidential candidate, businessman Donald Trump listens during a Republican presidential primary debate hosted by ABC News at the St. Anselm College Saturday, Feb. 6, 2016, in Manchester, N.H. (AP Photo/David Goldman)

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Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks to Republican presidential candidate, retired neurosurgeon Ben Carson as Republican presidential candidate, businessman Donald Trump listens during a Republican presidential primary debate hosted by ABC News at the St. Anselm College Saturday, Feb. 6, 2016, in Manchester, N.H. (AP Photo/David Goldman)

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Republican presidential candidate, businessman Donald Trump answers a question during a Republican presidential primary debate hosted by ABC News at the St. Anselm College Saturday, Feb. 6, 2016, in Manchester, N.H. (AP Photo/David Goldman)

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Republican presidential candidate, former Florida Gov. Jeb Bush and Republican presidential candidate, businessman Donald Trump spar as Republican presidential candidate, Sen. Marco Rubio, R-Fla., listens in the middle during a Republican presidential primary debate hosted by ABC News at the St. Anselm College Saturday, Feb. 6, 2016, in Manchester, N.H. (AP Photo/David Goldman)

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Patrolman James Pittman poses for a selfie with Republican presidential candidate Donald Trump. Mr. Trump was on the trail Thursday glad-handing in in New Hampshire, where he holds a sizable lead despite coming in second in Iowa. (Associated Press)

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Illustration on Donald Trump's negative ratings The Washington Times

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Republican presidential candidate Donald Trump signs autographs during a campaign stop at the Radisson Hotel, Friday, Jan. 29, 2016, in Nashua, N.H. (AP Photo/John Minchillo)

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hands on: Pastor Joshua Nink prays for Donald Trump after he and wife Melania attend church in Council Bluffs.

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Republican presidential candidate Chris Christie, in one of his final campaign pitches before the Iowa caucuses, compares his leadership credentials as New Jersey governor with that of Donald Trump, "whose only experience is being in a fake boardroom in New York City looking into a camera and saying, 'You're fired.'" (Associated Press/File)