Donald Trump

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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)

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Republican presidential candidate Donald Trump waves after speaking during a campaign stop on Wednesday, Jan. 27, 2016, in Gilbert, S.C. (AP Photo/Rainier Ehrhardt)

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Tim Constantine looks at the pros and cons of Donald Trump's decision to boycott the Fox News debate ahead of the Iowa caucuses.

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Republican presidential candidate Donald Trump arrives on stage before speaking during a campaign stop on Wednesday, Jan. 27, 2016, in Gilbert, S.C. (AP Photo/Rainier Ehrhardt)

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For Fox News, Donald Trump's absence could be disastrous. The candidate said his presence has helped the previous debates set records for viewership. "Without me, they'd have no ratings," he said in a Twitter post Tuesday as the feud erupted. (Associated Press)

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An Endorsement for Donald Trump Illustration by Greg Groesch/The Washington Times

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An Endorsement for Donald Trump Illustration by Greg Groesch/The Washington Times

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Sarah Palin praised Donald Trump for bucking the GOP establishment, injecting honesty into the political process and backing a strong military. She also chided critics who have questioned his conservatism — a dig at Ted Cruz, who has made that his main line of attack against the billionaire businessman. (Associated Press)

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Republican presidential candidate Donald Trump speaks during a campaign stop at Concord High School, Monday, Jan. 18, 2016, in Concord, N.H. (AP Photo/John Minchillo)

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Republican presidential candidate Donald Trump waves to his supporters as he leaves a campaign stop at Concord High School, Monday, Jan. 18, 2016, in Concord, N.H. (AP Photo/John Minchillo)

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Republican presidential candidate Donald Trump speaks at the South Carolina Tea Party Convention, Saturday, Jan. 16, 2016, at the Springmaid Beach Resort in Myrtle Beach, S.C.(AP Photo/Willis Glassgow)

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Republican presidential candidate Donald Trump speaks at the South Carolina Tea Party Convention, Saturday, Jan. 16, 2016, at the Springmaid Beach Resort in Myrtle Beach, S.C.(AP Photo/Willis Glassgow)

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Republican presidential candidate Donald Trump speaks during a campaign stop, Saturday, Jan. 16, 2016, in Portsmouth, N.H. (AP Photo/Matt Rourke)

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Republican presidential candidate, Sen. Marco Rubio, R-Fla., Republican presidential candidate, businessman Donald Trump and Republican presidential candidate, Sen. Ted Cruz, R-Texas, from left, participate during the Fox Business Network Republican presidential debate at the North Charleston Coliseum, Thursday, Jan. 14, 2016, in North Charleston, S.C. (AP Photo/Rainier Ehrhardt) ** FILE **

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Republican presidential candidate, businessman Donald Trump, left, speaks as Republican presidential candidate, Sen. Ted Cruz, R-Texas, looks on during the Fox Business Network Republican presidential debate at the North Charleston Coliseum, Thursday, Jan. 14, 2016, in North Charleston, S.C. (AP Photo/Rainier Ehrhardt)

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Republican presidential candidates, from left, Ohio Gov. John Kasich, New Jersey Gov. Chris Christie, Sen. Marco Rubio, R-Fla., businessman Donald Trump, Sen. Ted Cruz, R-Texas, retired neurosurgeon Ben Carson and former Florida Gov. Jeb Bush participate during the Fox Business Network Republican presidential debate at the North Charleston Coliseum, Thursday, Jan. 14, 2016, in North Charleston, S.C. (AP Photo/Chuck Burton) ** FILE **

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Republican presidential candidates, from left, Ohio Gov. John Kasich, New Jersey Gov. Chris Christie, Sen. Marco Rubio, R-Fla., businessman Donald Trump, Sen. Ted Cruz, R-Texas, retired neurosurgeon Ben Carson and former Florida Gov. Jeb Bush take the stage before the Fox Business Network Republican presidential debate at the North Charleston Coliseum, Thursday, Jan. 14, 2016, in North Charleston, S.C. (AP Photo/Rainier Ehrhardt)