I’d say stay in the UN, just stop funding it.
Rub their noses in it
Lather, rinse, repeat
Agree, stop funding it. Then charge RENT for the building at the going New York rate. Use the funds saved from membership fees and from the rent to build the wall 1 foot higher than planned.
Radical changes need to be implemented in the UN before the next set of Rats invade the White House. Time is of the essence. Make it quick—do it now!
Members must evacuate the building which is on US soil. Let them decide where to go to set up shop.