IMHO the US should stay in the UN organization but the location of the UN building should change.
The new facility should be integrated into a remote section of our Southern Border Wall. Money we’ve budgeted for UN money could be used for the construction as well as the money made from selling the current real estate.
Think of the many benefits, including less congestion in NYC.
Outside the wall. I would support that. On the Mexican side, but not touching the wall.