You been guzzling the coolaid....
Ya got millions of foreigners entering illegally, as biggov winks and nods, as they bring in 10,000 tons of dope and God knows what else every few months....Ya think the bad guys would not be able to bring in a nuclear weapon or some other nasty weapon which had been smuggled into Mehico?
Sober up.
Yes, I wrote that myself. The whole thing is pretty much null and void as the southern border continues to bleed in terrorist.