re: My girlfriend of 3 years gave me an ultimatum today

This isn’t about Trump. Even if you weren’t a Trump supporter, this would be the reddest of flags. Any woman who issues ultimatums based on something like that isn’t fully invested in the relationship. You don’t bet what you’re not willing to lose, and she’s betting the relationship. That means she already has one foot out and is looking for an excuse to break up without feeling bad about it. There’s a good chance that she’s already dating someone else, or wants to, in California.

Also, any woman who successfully gets her way through an ultimatum will go back to that well again in the future. The more times you cave, the harder it will be to not cave, and the more she will resort to emotional blackmail and brinkmanship to control you and the relationship.

I wouldn’t even mention Trump in your response to her. Just break up with her saying that anyone willing to issue an ultimatum based on something so petty clearly isn’t worth your time or attention.