With Trump, you can never tell whether he's just blustering or he actually means what he says. So do you think that when he loses the election, he'll come whining to his very Trumpy Supreme Court to bail him out and declare him a winner, as he has repeatedly threatened?
Also, do you think Republican state legislatures will invalidate their citizens' votes and send their own handpicked electors to the Electoral College, as many of them have threatened to do, on the pretext that the voting in their states was "rigged"?
We know that both Trump and his Republican slaves will claim that the election was rigged, and the bigger the landslide, the louder they'll scream. They'll claim, with no evidence whatsoever, that mail-in ballots are fraudulent and none of them should be counted. They'll also say that no votes should be counted after November 3rd---even if states allow that for mail-in ballots.
The nightmare scenario is that we have an election where the people's votes say one thing and Trump's courts say another. If the latter prevails--well, you don't like rioting? There will be LOTS of that in states whose voters are told their votes didn't count! Americans will have ZERO faith in their institutions if a fascist strongman wannabe and his allies can negate the results of an election!
Or is this all Republican bluff, bluster, and bullshit, and Trump will accept his loss graciously and submit to a peaceful transfer of power, with minimal whining?