Trump doesn't let self-contradiction get in his way. When informed of Putin's move on Ukraine he spoke of it as 'genius' indicating he thought it was 'smart'. He now says he didn't mean it approvingly, but that's not so clear. He is currently saying that if he was President Putin "wouldn't dare" (invade).

I think that a debate against Trump could be successful if the debater sticks to his guns and hammers out the contradictions that are inherent in Trump's self-aggrandizing arguments. Likewise that his information does'nt hold up in a factual manner, as sometimes happens in this forum.