Would he, though? I know the top US military brass have gone through some changes during this administration, but if the military sees a lawful impeachment and lawful conviction, I think enough would refuse (clearly illegal) orders to keep Trump in the White House.

Honestly I'd be more worried about the loyalists at the top of the FBI, US Marshals, Secret Service, etc.

Either way, it's incredibly improbable that Democrats will control a supermajority of the Senate next year (or, failing that, have enough Republican support to convict), so we probably won't have to find out what happens in this scenario.

A fuckup or two like ICE had and the whole narrative quickly turns to shit and the people push back.