Donald Trump speaks at Sen. Joni Ernst's Roast and Ride Fundraiser on the Iowa State Fairgrounds in Des Moines, Iowa. Clay Masters/Iowa Public Radio hide caption

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Trump Promises Crackdown On Immigrants At Iowa 'Roast And Ride' Event

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Retired neurosurgeon Dr. Ben Carson speaks at the Republican National Convention on July 19 in Cleveland. Chip Somodevilla/Getty Images hide caption

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Carson Defends Trump's Minority Outreach As Break From 'Traditional' Politics

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Breitbart's Milo Yiannopoulos, a self-proclaimed leader of the movement, co-wrote a manifesto of sorts about what the alt-right believes. Drew Angerer/Getty Images hide caption

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What You Need To Know About The Alt-Right Movement

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The Walizer Farm in Howard, Pa., is home to three generations of Trump supporters: Jim Walizer (from left), Jason Walizer and Dennis Walizer. Courtesy of Jason Walizer hide caption

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After A Rough Summer, Pennsylvania Trump Fans Explain Why He Is Still Their Guy

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Donald Trump speaks at a rally in Green Bay, Wis., on Aug. 5. Michael Kranish and his colleague Marc Fisher are the authors of Trump Revealed, a biography about Trump's life and career that is based on the work of more than 20 of the Post's reporters, editors and fact-checkers. Darren Hauck/Getty Images hide caption

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Trump Off Camera: The Man Behind The 'In-Your-Face Provocateur'

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Donald Trump holds a media conference announcing the establishment of Trump University in New York City. Thos Robinson/Getty Images hide caption

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How The Man Created The Brand In 'Trump Revealed'

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Donald Trump campaigns in Michigan on Friday. Gerald Herbert/AP hide caption

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'To Be Determined': Trump Campaign Signals He May Moderate Immigration Stance

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Conservative donor David Koch in a 2013 file photo. The political network he and his brother, Charles, have created is not backing Donald Trump's presidential bid this year. Phelan M. Ebenhack/AP hide caption

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Koch Network Building A Senate Wall Against Trump

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