Trump knows she'll absolutely crush his dumb, lying ass. There will be no further presidential debates this cycle.
Instead we'll get a ton of sound bites about how she's being snuck in "behind America's back" and is, as the tweet says, 'illegitimate'.
This also sets the groundwork for his post election whining if he loses.
Honestly, I don't know. I do not want Trump again. I do not believe America will survive it. Truly I don't. But I have strong concerns about Harris' chances. I don't have the faith right now and it's horribly depressing.