I feel like he would just make stuff up, say insulting things about him, and talk poorly and aggressively about his wife. Kinda like he did to the candidates in 2016 like Ted Cruz and Jeb Bush.
Cadet Bone Spurs insulting a high ranking military officer and astronaut isn't going to sit well with the undecideds, or those "Republicans" who have to hold their noses when they cast a vote.
Anything he says about Giffords is going to backfire spectacularly: she was severely injured; he scratched his ear.