President Trump said Sen. John McCain should "be careful" because "at some point, I fight back," after the Arizona Republican warned against "half-baked, spurious nationalism" in a speech Monday night. Trump made the remark Tuesday during an interview with radio host Chris Plante. Plante asked Trump if had heard McCain's remarks from the night before. "Yeah well, I hear it," Trump said. "People have to be careful because at some point, I fight back. I'm being nice. I'm being very, very nice.