Donald Trump

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Republican presidential candidate Donald Trump speaks at a town hall event Thursday, Sept. 17, 2015, in Rochester, N.H. (AP Photo/Robert F. Bukaty) ** FILE **

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Republican presidential candidates (from left) Rick Santorum, George Pataki, Rand Paul, Mike Huckabee, Marco Rubio, Ted Cruz, Ben Carson, Donald Trump, Jeb Bush, Scott Walker, Carly Fiorina, John Kasich and Chris Christie take the stage during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday in Simi Valley, Calif. (Associated Press) ** FILE **

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Republican presidential candidates Ben Carson, left, and Donald Trump talk before the start of the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill) ** FILE **

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Republican presidential candidate, former Florida Gov. Jeb Bush, right, watches as Donald Trump speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)

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Republican presidential candidate, businessman Donald Trump, top, talks with Carly Fiorina following the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)

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Republican presidential candidates Ted Cruz, left, Ben Carson, second from left, Donald Trump, second from right, and Jeb Bush appear during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)

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Republican presidential candidates, former Florida Gov. Jeb Bush, right, and Donald Trump both speak during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)

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Then-Republican presidential candidate Donald Trump, left, and Jeb Bush slap hands near the finish of the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill) ** FILE **

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Republican presidential candidate, businessman Donald Trump speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)

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Tim Constantine reports on an investigation into Huma Abedin, Bernie Sanders poll numbers, and Donald Trump taking on Ben Carson.

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Illustration on the rise of Donald Trump by Nancy Ohanian/Tribune Content Agency

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Relaxed on ivory leather seating, Amanda Miller shows the 24 karat gold-plated seatbelts inside Donald Trump's famous 757 jet aircraft; behind her is the full kitchen. (Image from 'Trump's 757')

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FILE - In this Aug. 11, 2015, file photo, Republican presidential candidate Donald Trump appears before addressing a GOP fundraising event in Birch Run, Mich. Trump insults. He exaggerates. He dismisses the need for public policy ideas, gets confused about world affairs and sometimes says things that flat out aren't true. And the cheers from his supporters only grow louder. (AP Photo/Carlos Osorio)

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Republican presidential candidate Donald Trump speaks at the National Federation of Republican Assemblies on Saturday, Aug. 29, 2015, in Nashville, Tenn. (AP Photo/Mark Humphrey) ** FILE **

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Republican presidential candidate Donald Trump says he has "evolved on numerous issues" including health care, abortion rights and a 14.25 percent tax on the rich. Some tea party conservatives have concerns about his convictions on these and other issues. (Associated Press)