>Trump, in the afterlife, gets permission to go back and visit Earth for one hour. He goes into a bar in NYC and asks the bartender how things are going for America. The amazed man says, "Wow, sir, we have the most incredible empire thanks to you! Greenland, Panama, and Canada!" "That's great," says Trump, "What about Europe?" "Oh yes," says the bartender, "They also couldn't resist us!" "That's so beautiful," says Trump. "Well, I have to go back now, how much do I owe you?" "One ruble and fifty kopeks," replies the bartender.
Greenland could probably be induced to vote Republican fairly easily, and so send 2 Republican senators to Congress.
I've just spitballing, of course - in the current situation the GOP is not in the position to throw away any advantage in the House.
Trump's "51st state rhetoric" doesn't actually have to be what happens, were he to do something drastic.