Juliette Kayyem: “It is almost impossible to detect in a democracy.”

The lie leads to the violence, you can't deny it anymore.

It's pretty clear that there is no day two plan by the Israelis, that this is -- by the buildup that you're showing, this does not look like a strategic strike.

The big lie is direct -- directly motivates violence, because in the white supremacist viewpoint, and in these radicalized groups viewpoints, when something is stolen, they can rightfully use violence to get it back.

What we need to do is police and target our resources so that we stop people from entering illegally or if they present themselves at a border crossing, ensure they never make it in if they are in fact a terror threat.