FILE - In this Jan. 26, 2016 file photo, then-Republican presidential candidate Donald Trump was joined by Joe Arpaio, the sheriff of metro Phoenix, during a news 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)