So people have to decide. Do they want to have the security? Do they want to continue to plug the gap [in border security] that GAO has identified and recognize that there will be some costs to doing that? Or do we want to make sure that business isn't hampered and that people can move back and forth readily, and recognize that, if we don't put some barriers in place, we're going to wind up with dangerous people coming into the country?

Even the kinds of ingredients you can find in your own kitchen can be used to make bombs. So the problem is with the people and not with the tools.

The fact that we have not had a terrorist attack in this country in the last six years is not a cause for complacency or a time to celebrate the end of the struggle. The threat is not going away. The enemy has not lost interest. ...Fundamentally, we're in a struggle about ideology. Terrorists want to remake the world in their own image and it is the image that is intolerant of the kinds of institutions that we cherish.

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.

And I have to say, I agree with some of the criticisms that some have made about that state program which allocates the grant money on a very rigid formula all across the country, with a certain percentage to each state.

We don't really have the ability to enforce the law with respect to illegal work in this country in a way that's truly effective...We haven't been able to require every employer to enter a system in which they check the work status of their employees and determine whether they're legal, and without that, we don't really have the ability to enforce the law with respect to illegal work in this country in a way that's truly effective. And that would be the single greatest additional weapon we could use if we're serious about tackling this problem.

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.