FILE - In this Jan. 26, 2016 file photo, then-Republican presidential candidate Donald Trump is joined by Joe Arpaio, the sheriff of metro Phoenix, at a campaign event in Marshalltown, Iowa. Trump was just a few weeks into his candidacy in 2015 when came to Phoenix for a speech that ended up being a bigger moment in his campaign than most people realized at the time. And now Trump is coming back to Arizona at another crucial moment in his presidency. (AP Photo/Mary Altaffer, File)
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