He would rightfully ignore/insult her, as would most of the others running. Her dream of getting on a debate stage with him would never happen. Hell, it’s unlikely he’d even participate in debates period. Why should he?
If so, he should insist on Sean Hannity (yeah he's annoying but he's a friend of Trump) as the moderator. Last time Joe Biden got Chris Wallace. Now it's Trump's turn to pick his moderator.
Who would not fear the mighty power of Liz Cheney in the American conservative movement?
Okay, besides everyone?