We've evolved a lot since 9/11 also, in terms of our law enforcement capabilities, our intelligence capabilities, military, counterterrorism.

We are a nation of Christians and Muslims, Jews and Hindus, and nonbelievers.

There's some bittersweet feelings about leaving the people here [in the White House]. 'Cause even though all the team you assemble, you know, you're going to stay in touch with 'em, it's not the same, you know? The band kind of breaks up.

Keeping the people's government open is not a concession to me. Keeping vital service running and hundreds of thousands of Americans on the job is not something you 'give' to the other side.

Israel has legitimate concerns about its security relative to Iran. I mean, you have a large country with a significant military that has proclaimed that Israel shouldn't exist, that has denied the Holocaust, that has financed Hezbollah, and as a consequence, there are missiles that are pointed towards Tel Aviv. There are very good reasons why Israelis are nervous about Iran's position in the world generally.

Honestly this is not going to change unless the people who want to prevent these kinds of mass shootings from taking place feel at least as passionate, at least as mobilized and well-funded as the NRA and the gun manufacturers are because the politics in Congress are such where even members of Congress who know better are fearful if they vote their conscience and support common sense measures like background checks, they're worried they're going to lose.

We have to have better intelligence. We have to have better interdiction capabilities. And so the issue is not how much we spend or how hard we try; the issue is are we doing it the right way? Are we being smart about it?