As we all know during a recent campaign stop in Wisconsin Trump called Kamala Harris mentally disabled from birth while talking about the Biden/Harris approach to dealing with illegal immigration. He didn't say she lost her critical thinking skills but said what he said and took it to another level. Conservatives have memory-holed this since they're default voting for Trump anyway. A debate with a mentally disabled person should be a cakewalk for him. Why wouldn't he go for it?
Trump may well win. The polls show a clear horse race but if he loses the political autopsy of MAGA won't be hard to figure.