Really, America - this is the best you can do? Go sit in the corner and take a time-out for a few weeks to think this over.
The best strategy for handling Trump is the Reagan treatment of Carter. Then facts. Then "I'm rubber and you're glue" and downhill from there. Fun fact: tonight's debate is only a few hundred feet from where I was born.
The easiest way to shut Trump down - other than a Crucifix and garlic - is to politely smile, acknowledge his insanity and remind him how often he is wrong. Having some Holy Water in hand can't hurt either.