In this July 11, 2015 file photo, then-Republican presidential candidate Donald Trump finishes up speaking before a crowd of 3,500 in Phoenix. 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. He returned there Tuesday and implicitly criticized Arizona GOP Sen. Jeff Flake.
In this July 11, 2015 file photo, then-Republican presidential candidate Donald Trump finishes up speaking before a crowd of 3,500 in Phoenix. 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. He returned there Tuesday and implicitly criticized Arizona GOP Sen. Jeff Flake. Ross D. Franklin AP
In this July 11, 2015 file photo, then-Republican presidential candidate Donald Trump finishes up speaking before a crowd of 3,500 in Phoenix. 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. He returned there Tuesday and implicitly criticized Arizona GOP Sen. Jeff Flake. Ross D. Franklin AP

RNC will defend GOP nominees — even ones Trump trashes

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