It ain't gonna happen Bill.  9/11 NEVER threatened our national integrity, if anything it strengthened our national commitment.  Hand guns weren't worth a damn in stopping the 9/11 terrorist, or the OK City bomber.(the white guy who DID think he could start a war) 

Mexico is a bit special.  Republicans, through Reagan had open arms for immigrant labor, it's a well know fact that California agriculture was a big influence on RR and for good reason - it benefitted the nation

My wife was raised in Santa Clara.  They had Mexican families in that area long before it was a US state.    Not sure how they would be considered an 'invasion'.     

Like you, I am serious worried about violent Latin American gangs that have overrun some of their own weak local governments, even corrupted those nations politics.  We are totally united in condemning/convicting/punishing those gangs.