Republican Presidential Candidate Donald Trump Campaigns Throughout Iowa [Getty Images]

MARSHALLTOWN, IA - JANUARY 26: Supporters try to meet Republican presidential candidate Donald Trump at a rally on January 26, 2016 in Marshalltown, Iowa. Sheriff Joe Arpaio, the anti-immigration sheriff from Maricopa County, Arizona, today announced his support for Trump's presidential bid. (Photo by Scott Olson/Getty Images)

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