This is the important part of Trump's quote which always gets left off by the mainstream media.
We actually have ways to figure it out, some of them quite logical and sensible.
But not under the current regime which refuses to admit we even have a problem with radical Islam. That would change in a hurry if the adults got put in charge.
What constitutes "figure out what the hell is going on?" When will we know it's OK to let them back in?