Unfortunately the Constitution only speaks to Senate ratifying and no mention to rescinding so a bit of a gray area although Carter and others withdrew us from treaties as well without formal Senate review or consent. Oh the things that were missed in the Constitution and lawmaking since.

He’d be screwed?

He's spreading his personal war in the U.S. abroad. I didn't hear anything in that list that might apply to taking over other countries.

This gentleman is right--it will take many, many years to just get back to where we were, and normal. I am very sad to see what our country has come to, and how much worse it could get if this tyrannical maniac isn't stopped.