If there are demonstrations at the result will Trump order the police to shoot?
Will he bring in the military?
I think the immediate problem will be at the ballot box where he has encouraged his supporters to go out and intimidate:
“I’m urging my supporters to go into the polls and watch very carefully, because that’s what has to happen. I’m urging them to do it.”
It's often suggested Trumps supporters are stupid. They are not, or at least not totally stupid.
They will understand this coded message to intimidate democrat voters.