It will be interesting to see how she prepares for a debate with this clown. He pretty much says the same shit every time. In a vacuum it would be unpredictable, but we have a whole series of ramblings/word salads. The rules for this debate are identical to those of the CNN debate. There will be no wandering. And if he does wander toward her, she should just loudly snap her fingers next to his ear.
Some things to possibly do:
Responds to one of Trump’s BS comments by straight up laughing. Just laugh for the entirety of her allotted time for a response. Trump’s ego can shrug off a lot but he hates being laughed at.
Ignore him. if Trump answered a question with his usual nonsense and then, when it is Harris’ turn, she just said, “Think about what just came out of his mouth. It deserves no response.” And then she goes silent for her two minutes.
Harris repeats “loser” five or 10 times during the debate, Trump’s response could be to lose his shit, stamp his foot, scream “I’m not a loser!” He will lose any train of thought that he might have had, and he won’t be able to put together a coherent answer.
Harris can counter Trump’s firehose of lies is … not to try. It’s impossible. Trump does not do deep preparation for a debate. He engages in a Gish Gallop spewing all sorts of nonsense which can be impossible for his opponent to address. She needs to prepare some general counters like, “Just about everything that just came out of his mouth - what I could understand of it, anyway - was a lie. Here’s what my administration would do on this issue: [insert positive policy here.]” She has to be likable. Destroy him but in good humor.
Basically, she should do this: