Probably don't need to worry too much about Trump as a White House guest who would not leave.
It's on the grid - public water, electricity, cable. Flip the switch and without FOX and Twitter, he'd reconsider his options.
(Probably there are generators and a store of essential provisions in case of a real emergency, but it's not a bunker where you could hide out comfortably for years.)
And for an extended stay/coup to be successful, the leader has to have the support of the military.
HIs bedroom window may be made out of bricks, but "The National Guard stands around the door...."? Not in this case.
Post 2020, ain't gonna work on D. Trump's farm no more...