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

MARSHALLTOWN, IA - JANUARY 26: Sheriff Joe Arpaio (L) of Maricopa County, Arizona listens as Republican presidential candidate Donald Trump speaks to the press prior to a rally on January 26, 2016 in Marshalltown, Iowa. Arpaio today announced his support for Trump's presidential bid. (Photo by Scott Olson/Getty Images)

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