But one thing that we have done in the last four years is we have really put pressure on the leadership of this organization [Al Qaeda]. We have killed a significant number of leaders. We've captured others. Those that remain have to look over their shoulders, they have to be on the run. So that even if we don't manage to kill or capture them all within four years, what we do do is put the kind of pressure on them that makes them focus on their own skins, as opposed to carrying out attacks.

The Department of Defense took 40 years to get where it got.

I think the idea that you can go this alone is - was a huge mistake. And unfortunately, there was a price paid in terms of suffering and pain for people in New Orleans.

There really is no vacation from the world in which we live.

You don't bargain with terrorists. You don't appease terrorists. And anybody who believes that this is about something we've done has to ask themselves why it is, on September 11, 2001, before we were in Afghanistan, before we were in Iraq, he committed a dastardly attack killing over 3,000 people. I mean, this is not a matter of negotiation; it's a matter of victory.

We now have capabilities in science and technology that raise the very realistic possibility that a small group of terrorists could kill not only thousands of people, as they did on September 11th, but hundreds of thousands of people. And that has changed the dimension of the threat we face.

We always monitor the flow of information, intelligence, threat streams to see whether we have any indication there's some imminent. We work hard to identify potential cells and disrupt them. This is one of the reasons we put so much emphasis on intelligence gathering.