So, you believe that of the 20 million or so illegal aliens in the country right now, we've caught *every* single one of them that has terroristic intentions?
Please.
Where did you get the 20 million figure? That sounds like something off of a xenophobe or white supremist site.
But the fact is that there has not been a single known terrorist who jumped the Souithern border, nor has one been caught trying. We have caught millions jumping the border (1 out of 3), if terrorists were using thsat method don't you think we would have caught at least one?
All known terrorists have flown into the U.S. using officially issued documents. There's no need for them to risk crossing the desert or swimming the Rio Grande. That's automatic arrest and interrogation if OTM is spotted.