Donald Trump

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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)

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Tim Constantine asks: After receiving support from the American Freedom Party, is Donald Trump a white supremacist?

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Republican presidential candidates Donald Trump and Sen. Ted Cruz squared off repeatedly during the Fox Business Network Republican presidential debate Thursday in North Charleston, S.C. (Associated Press)

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Donald Trump

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Republican presidential candidate Donald Trump speaks during a campaign stop before next months earliest in the nation presidential primary, Monday, Jan. 11, 2016, in Windham, N.H. (AP Photo/Jim Cole)

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Establishment Republican leaders already are working to deny Donald Trump the nomination. Their operatives are quietly recruiting prospective delegates to commit to voting for someone other than Mr. Trump if the nomination goes to a second ballot July 18. (Associated Press)