Donald Trump

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Republican presidential candidate Donald Trump speaks during a campaign rally, Wednesday, April 6, 2016, in Bethpage, N.Y. (AP Photo/Julie Jacobson)

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Republican front-runner Donald Trump stands with law enforcement officers during a campaign stop in West Allis, Wisconsin on Monday. (Donald J. Trump for President, Inc.)

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Republican presidential candidate Donald Trump speaks during a campaign event, Monday, April 4, 2016, in La Crosse, Wis. (AP Photo/Paul Sancya)

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A young girl waits to see Republican presidential candidate, Donald Trump, after a rally at Nathan Hale High School, Sunday, April 3, 2016, in West Allis, Wis. (AP Photo/Charles Rex Arbogast)

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Republican presidential candidate, Donald Trump, reads The Snake poem during a rally at Nathan Hale High School, Sunday, April 3, 2016, in West Allis, Wis. (AP Photo/Charles Rex Arbogast)

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Republican presidential candidate Donald Trump speaks Saturday, April 2, 2016, during a campaign rally at Memorial High School in Eau Claire, Wis. (AP Photo/Jim Mone)

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Former Gov. Sarah Palin speaks at a rally for Republican presidential candidate Donald Trump during a campaign event, Saturday, April 2, 2016, in Racine, Wisc. (AP Photo/Paul Sancya)

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Republican presidential candidate Donald Trump speaks at a campaign stop, Wednesday, March 30, 2016, in Appleton, Wis. (AP Photo/Nam Y. Huh)

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A girl who was protesting Republican presidential candidate Donald Trump at rally in Janesville, Wis., on March 29, 2016, is escorted by police after being pepper-sprayed by a man in a crowd during a confrontation outside the hotel where Trump was speaking. Her face was stained by the spray. (Amber Arnold/Wisconsin State Journal via AP) **FILE**

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Donald Trump has received high unfavorable ratings among women. A recent Fox News national poll showed 67 percent of women had negative views of Mr. Trump compared with 30 percent who had favorable views. (Associated Press)

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Republican presidential candidate Donald Trump speaks at a campaign stop, Tuesday, March 29, 2016, in Janesville, Wis. (AP Photo/Nam Y. Huh)

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Republican presidential candidates, Sen. Marco Rubio, R-Fla., from left, Donald Trump, Sen. Ted Cruz, R-Texas, and Ohio Gov. John Kasich, stand together during the signing of the National Anthem, before the start of the Republican presidential debate sponsored by CNN, Salem Media Group and the Washington Times at the University of Miami, Thursday, March 10, 2016, in Coral Gables, Fla. (AP Photo/Wilfredo Lee)

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In this photo taken Dec. 2, 2015, Republican presidential candidate Donald Trump speaks during an interview with the Associated Press at the Trump National Golf Club in Sterling, Va. In television news, a telephone interview is usually frowned upon. Yet Donald Trump's fondness for them is changing habits and causing consternation in newsrooms, while altering traditions of political access. (AP Photo/Andrew Harnik)

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The Islamic State terrorist group has featured remarks made by GOP presidential front-runner Donald Trump in a video celebrating the deadly attacks this week in Brussels.

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In this March 19, 2016 file photo, a supporter holds a sign as Republican presidential candidate Donald Trump speaks during a campaign rally in Fountain Hills, Ariz. (AP Photo/Matt York, File)

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In this March 19, 2016, photo, Republican presidential candidate Donald Trump speaks during a campaign rally in Tucson, Ariz. (AP Photo/Ross D. Franklin)

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Donald Trump predicts he will enter the Republican National Convention in Cleveland this summer with as many as 1,450 delegates. Other prognosticators say he will be lucky to eke out the 1,237 majority needed for the party's presidential nomination. (Associated Press)

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In this March 14, 2016, photo, Republican presidential candidate Donald Trump speaks at a rally at Lenoir-Rhyne University in Hickory, N.C. (AP Photo/Chuck Burton) ** FILE **