"Invoke P!"

"All Trump and Barr need is a friend to produce some evidence for their conspiracy theory. Maybe, oh, in the form of a classified report that just so happens to leak to Sean Hannity. You don’t need a crystal ball to predict where this will go." https://t.co/PJsgDuqTv3

— Bill Kristol (@BillKristol) September 8, 2020

He could demand a congressional investigation. Or demand that the new Biden administration face the scrutiny of a special prosecutor. He could call for the election results to be overturned, even when the process is long over and no mechanism for such an overturning exists. What would stop him? Remember, this kind of evidence-free demand for investigations of a sitting Democratic president is what Trump’s 2016 campaign was based upon. It’s what made him the most powerful man on Earth. It’s what he does. It’s who he is. And it would keep him relevant, especially to his Fox News-InfoWars base, through Biden’s presidency.

Trump could do all of this. But if we’ve learned anything in 4 years, it is that the President’s words are not performative. Trump can cry “Fraud!” and “Hoax!” and “Invoke P!,” but still nothing happens. A lame-duck President calling for a special investigation of his successor? The very definition of a nullity. Demand a Congressional investigation? Ditto. Demand the election be overturned? Even the Supreme Court can’t do that. And while a conspiracy theory may be a shiny unprovable (or disprovable) bauble in the press, it’s useless in court. And the courts are the only possible place an electoral outcome can be challenged.

You don’t need a crystal ball to predict where this will go. (Well south of "nowhere").  I think this is actually a more cogent analysis of the situation:

Maybe, just maybe, though, Trump’s counterfeit-ballot conspiracy theory is a way he’s trying to save face. Given the polling, he, too, has to make preparations. Preparations to lose and explain to the public what happened to the supposed greatest president in history.

He’ll never blame himself, of course. And, in his mind, you can see how it would be a bit of warped, ‘bothsides,’ poetic justice if he could blame his loss on the supposed intervention of a foreign country, in the way he thinks Democrats explained away their loss in 2016. He wouldn’t be a loser; he’d be a victim of the country he’s said has been “ripping us off” all along.

That's where Trump is going with his complaints; it's the only place he can go.  Why else did he spend millions on campaign ads in D.C.?  So he would see them, not so he would win D.C.  Why, in four years, hasn't he put forward a plan to replace Obamacare?  Because he doesn't know how to, or even care to.  All he understands (he thinks) is campaigning.  That's why he set up a re-election campaign the moment he was sworn in.  And he went through nearly a billion dollars, no small portion of which undoubtedly went into his pockets (given his track record with his charity, is that so hard to believe?).  Trump knows how to do one thing:  get press attention.  But his campaign can't overcome his constant effort to hit himself in the face.  Joe Biden is ahead in the polls?  Not so much as Trump is behind.  He beat Hillary Clinton the same way, except she was behind in voter enthusiasm and Trump wasn't.  Now the enthusiasm is against Trump, and he fuels it every day with his next tweet or press conference or campaign appearance.  Trump in November is going to scream "hoax" and "fake" and every other epithet he can.  What he can't do, is turn any of that into anything that happens.  The very essence of performative action is that the word creates the deed.  But Trump is the most non-performative President in American history.  His words are practically anti-deeds.  He's going to be a study in performative language long after he's gone; in how it doesn't happen when it's supposed to.