The last time trump showed up to a debate he was hopped up on steroids and proceeded to have a near meltdown on national TV. There’s a very good argument to be made that that performance was a not insignificant part of why Trump lost in 2020.
I for one cannot wait for Biden to goad him into an apoplexy of rage onstage with, hopefully, intervention by secret service. All Biden has to do is suggest trump isn’t very smart and hell spend the rest of the time fuming and making himself look like a moron.