I don't see anything in the oath I took about the UN. Anyone in a blue helmet on American soil is a enemy. Period. They will also be a good point of re-supply. They will probably be issued some pretty neat gadgets. Stock up on ammo, mags, maybe even some night vision and radios.
Write your Senators. One of mine is all for this crap, but he's retiring after this year. The other one is a firm supporter of the Constitution and the 2nd Amendment.
Find your Senators here. They will have a contact page.
Write your Rep too.
While your writing, Tell them we want the UN out of this country and we want all funding cut off. Let them set up shop in one of those countries that hates us.