Trump is already blowing dog whistles for the terrorists, saying that he'll declare himself the winner if he's ahead by tomorrow. Actually with all the mail in ballots, a lot of places won't even be able to declare with finality by tomorrow.
Here's a post that describes when results come out of each state. For example, Alaska doesn't even begin counting absentee ballots until Nov 10. Illinois accepts mail-in ballots until Nov 17
He's setting things up for a disaster
Bernie noted it as well