Trump is brilliantly moving the goal line against the liberals which is their favorite tactic. Everytime a liberal is losing they just double down and push the goal line further away to buy time and sometimes they even succeed in redefining their loss as a win. Trump is savy to this behavior so he comes out and says “Mexico is going to pay for building the wall”, they freak out and say no Mexico is not going to pay for the wall. Notice how building the wall is no longer being debated, just who is paying for it? Then he says I am going to pick a VP that makes me look like a moderate (Pence, Gingrich, etc.) and the media then flips out going oh my God what happens if Trump gets elected and this guy ends up in power. Suddenly they are not debating that he can be elected as President. Pretty funny.
Trump is the master of deploying the political whoopee cushion, which is why he is the GOP Presidential nominee.