Fortunately the elections are not a federal function. Canceling the elections would constitute a coup. Besides, the real election is the Electoral College - and the state governments could select Electors directly.If the presidency is stolen, it will be done in the counting of the votes and not in Washington.
I think it best not to speculate on the havoc a rogue president could perpetrate between now and Inauguration Day. Problem is, presidents don’t throw their predecessors in jail - for the simple reason that just giving up power gracefully is too big a bargaining chip. Anyone who jails his predecessor will not himself peacefully abdicate when his own legitimate term expires.
or they could just manipulate the electoral college.