Hope is the denial of reality
If the goal is to slash funding to the UN and win points domestically... yes? The American public has long though foreign aid is much larger than what it actually is. There is little tolerance to kowtow to the UN. Heck look at the senate vote on this, pretty bi-partisan when it comes to the embassy situation, a 93-5 margin in 1995 to move it.
Plus we likely will have other countries following suit, making America the leader, the country who goes first and the country that gets people on board to realize the obvious.
http://www.bbc.com/news/world-latin-america-42475253