This is one of the more idiotic right-wing ideas which has been floating through the fever-swamps of the fringe for a few decades. And there a lot of crazy ideas in those swamps. Leaving the UN would largely leave the US out of world affairs and would mean we are abandoning the UN's key mission: preventing world wars. I'm sorry the world is such a scary place, full of unsettling foreigners who might have needs and thoughts of their own, and I'm especially sorry that working together with others may sometimes result in tough negotiations and (gasp) compromises. If GOP lawmakers want to absent themselves from civilized conversation, they are welcome to leave office and go build private bunkers somewhere. The rest of us have work to do - and it's best done in an agreed neutral and (wait for it...) safe space like the United Nations we founded and have hosted since the last time the world tried to tear itself apart.