Big mistake to add to her rapid coronation
Definitely NO debates until she and her VP are formally nominated.
If I were Trump, my going-in position would be no discussions with any sort of a ‘presumptive’ selectee until the official nomination process at the DNC has been formally completed. The debate with Biden was something different, IMO, and certainly not at the level of “Harris is a legitimate candidate, yet.”
IMO, he should have just demurred discussing it until then.