NuDan, did you ever see the movie War Games? At the end, the computer plays out all the doomsday scenarios and concludes, "Interesting game. The only way to win is not to play." There's a lesson there for anyone interested in "debating" with Madman.
His views are what they are. He'll never change his mind. He is seldom interested in any point you make. He uses "negative association" tactics. For example, mention you heard that Hillary Clinton's motorcade passed through your town two weeks ago and he'll take that and cast you as a Clinton supporter who works tirelessly in her campaign and secretly writes love poetry in her honor. He claims you said things you never said and then uses that to paint you as an unpatriotic Commie sympathizer who probably smokes cigars with Fidel Castro and doesn't even like apple pie. All this results in keeping you completely occupied with correcting his BS rather than articulating your own point of view.
Sadly, any valid points he makes - and in fairness, he does make some - are obscured by this unnecessary approach.
Trust me, you'd do better putting on a steak suit and "debating" a tank full of starving sharks.