Trump's Discipline in the Republican Primary

Last night was a reminder of who the Republican base is, says CNN's John Avlon. Trump showed some discipline at the beginning but then lost it when Caitlyn Jenner pushed him too hard and he became his old Trump self,. He clearly has advisors who workshop answers with him on trickier questions like, why did you do a coup? "I think what, if there was one part of last night that was worthwhile, it was a reminder ... how much they love Trump," said Avlon.