There were a lot of doozies but I'm surprised no one has mentioned this particular moment of what-the-fuckery:
"TRUMP: I'm not going to tell you anything about what response I do. I don't talk about military response. I don't say I'm going into Mosul in four months. 'We are going to attack Mosul in four months.' Then three months later, 'We are going to attack Mosul in one month.' 'Next week, we are going to attack Mosul.'
In the meantime, Mosul is very, very difficult. Do you know why? Because I don't talk about military, and I don't talk about certain other things, you're going to be surprised to hear that. And by the way, my whole campaign, I'd say that. So I don't have to tell you. I don't want to be one of these guys that say, 'Yes, here's what we're going to do.' I don't have to do that. I don't have to tell you what I'm going to do in North Korea."
Um. You kind of do need to tell people that you're planning on aggressively invading a sovereign nation, even if you only tell Congress. That's sort of how these things work...