I think pretty much DJT would just have to stand there & FJB aka Captain Dementia would very shortly resort to yelling & being his nasty self. His public appearances are tightly controlled in all aspects & with DJT on the stage, that level of control wouldn’t be possible.
I wonder if he’d have to have a card with DJT’s picture on it like he does when he meets foreign dignitaries?/s
Yes, I agree. There’s no way to control a debate to the degree that would be needed.