It will come to this. A 90-minute faceoff that will put Ali-Frazier, Duke-Carolina and all 50 Super Bowls in the shade.

Trump has done a lot of debates in this campaign. But every one has been a multi-candidate show. He has had the good luck of being on stage with anywhere from four to seven dwarves. All of whom have been perfect punching bags. Not to mention the moderators.

Sometimes you have to admire Trump for his sheer effrontery and rule-flouting. Like his Tweet today: “Mitt Romney, who was one of the dumbest and worst candidates in the history of Republican politics, is now pushing me on tax returns. Dope!”

That’s one of the best 25-word ripostes you’ll ever see in politics. It’s refreshing. You rarely politicians call each other “dumb” and “dope” publicly. But that’s how we talk about them. And that’s the way Trump talks in debates.

This fall will be different. There will be two candidates on the stage. Trump will face one opponent. A woman, first of all, which makes his trademark rabbit-punching more problematic. More than that, he’ll face a tough, smart, savvy, experienced warrior. Who knows how to handle hostile Republicans. And who can be a great debater.

Look at a 90-minute debate this way. The ever-loquacious, show-off moderators will take up 20 minutes with their studiously stilted introductions and too-lengthy questions. That leaves 70 minutes for the candidates to talk. That means 35 minutes of straight Trump.

That should do it.