They [ French] still have an open border in Europe. And they have a Europe which doesn't have an integrated intelligence system like we do in the United States.

Banning the burkini doesn't produce terrorists. But it does make the people who are already alienated, who are already disenfranchised, I many cases, economically disenfranchised in a place like France in many of those neighborhoods, and make them say, ah, ISIS's message is true and real.

We need additional funding for more U.S. combat brigades in Europe. NATO needs to continue to modernize. It is starting to show with the Russians but these exercises are central to show that the alliance is firm, especially as the E.U. starts to have some weakness on the economic front.

ISIS, in some cases like Paris, may actually try to direct. But what it's really trying to do is inspire. So its directed activities are these inspired attacks.

I think the refugee problem is Europe is vastly worse than we have in the United States.

I don't think bulk data collection was an enormous factor here, because generally, that deals with overseas calls to the United States. But what bulk data collection did was make the process more efficient. So there were no silver bullets there.

When you do have really tapped out resources that cover so many investigations, it can help you move through and discard some faster.