How many have not been caught? How many terrorists are in our nation?

That's a great question, SSgt Alex Robinson. Unfortunately, the answer is, who knows? The US Government has failed to secure our borders, and may well pay the price for the belief that we are invincible, and that all our incoming refugees are "widows and orphans.".

As many are here as want to be. We make no effort to keep them out and have no idea who is here,

With the refusal of this administration to control the border there are most likely quite a few sleeper cells here already.