Might as well just tell them to stop coming. Should work out just as well.
"Hey Mexico, we're gonna build this huge fucking wall all the way across the border. Now, its gonna be real 'spensive. We need it to be really fucking big cuz thats how we do shit here in Merica. Its gonna take alotta gas to haul all them supplies down there...maybe that Hugo Cesar Chavez kin help, hes one of you guys right? And were gonna need a buncha troops down there so yous lil jumpin beans dont get up over that dang thing. Gonna cost us real good, ya hear? Ya'll wouldnt mind footin the bill on this one would ya?"
-Invadertard
"Yeah....no."
-Mexico
"Well, dang. Guess the folks wont mind if we double there taxes. Hey, one other thing...can you guys use a few dozen factories?"