Not quite. That'd be a step, but only a step.
We are out of time.
There is not time to investigate all of the millions of enemy aliens in the U.S. Therefore what we should do is:
-Announce that all non-U.S.-citizens who are citizens of terror-supporting states are considered enemy aliens and must leave at once;
-Round up and deport all such individuals who are here on student visas, green cards, expired visas, etc.
-Begin exhaustive background checks of every single "naturalized citizen" from any terror-supporting nation.
-Stop issuing visas--any visas--to nationals of any nation that supports terror--for any reason.
-Seal the borders. Use National Guard troops if necessary.
We will probably not do most of these--I'd be surprised if we did any of them. And we shall deserve what we get for our failure to act.
Of course, we could get wise--after an American city or two disappears.
--Boris