A day after showcasing Republican unity, President Trump is warning a GOP Senator about new attacks.
FOX's Jared Halpern has more from Capitol Hill:
Arizona Senator John McCain warned against half-baked, spurious nationalism in a speech last night, this morning telling reporters his remarks are not specifically aimed at President Trump:
(McCain) "I was referring to the whole atmosphere and environment around here. This idea that quote America firsters."
In a radio interview, President Trump warned, at some point, he would fight back and it won't be pretty.
McCain response: that's fine, saying he's faced some fairly significant adversaries in the past.
On Capitol Hill, Jared Halpern, FOX News.