It would make little, to no difference. Too little, too late. Even Nikki can't save him now. The metrics and polls for Harris just keep rising and Trump's tactics of acting angry and calling people names all day isn't funny anymore. It's childish and not at all what America wants. They want someone who smiles, laughs, isn't negative and bitter about the world and who isn't a convicted felon.
There is no way out now for the elderly, confused, criminal, lying, sex offender that's trying to run for president. What a weird joke.