US to leave the UN?

[Skoob]

I'll preface by stating that I'm not all that current on world politics. This may sound like a dumb question.

While traveling in the car over the holiday a saw a couple signs advocating the US ceasing participation with the United Nations. I'm curious. Why would anyone want the US to leave the UN? Was it some certain event (or specific series of events)? Or, is it just general disdain for the UN.

Is there anyone out there that thinks the US should depart from the UN or knows why someone would want us to? Please explain this to me.