But there is nothing he can do about it. There is no constitutional provision for ever canceling an election or remaining in office. That is just silly scare mongering like many of the other claims people have made on JPP, call-in talk shows, etc.
Unfortunately, it is more complex than that. There is a Constitutional fig leaf trump could find. States have the right to appoint Electors in the manor of their choosing, which does not need to be an election. trump is looking into having states that Republicans control, but vote for Biden appointing Electors other than the ones voted for. In theory, both the elected Electors and the appointed Electors would meet. After that, both Biden and trump could claim victory.
I would hope people like Flash would join Democrats in calling out trump's cheating... But I doubt it.