What is your definition of an invasion?

Is it masses of Central American people crossing the border illegally? Is it tens of thousand of OTM's (Other Than Mexicans) annually? Is having the Mexican Army and Federal Police crossing over the border - for numerous reasons - and working hand in hand with drug gangs and coyotes - reason enough for a military presence?

Again - the issue here is political, not military - for now. If the powers that be truly wanted to lock the border down, it could be done. But neither party really wants that, so all of the issues with a leaky southern border will remain, probably forever. Votes and cheap labor...bringing the two parties closer together day by day...that's the lesson learned from the Mexican border.