The United States has to be a leader in the world, because the problem is: If we are not leading, nobody else will.

The political and substantive reality is that the agenda has to change. I don't think they have any choice.

The potential for the next Pearl Harbor could very well be a cyber-attack.

One of the principal qualities that you need as national security adviser is trust, the trust of the president. And that depends on truth and it depends on honesty.

If the Iraqis fail to implement the reforms, if they fail to get a handle on the violence, there's nothing the United States can do, militarily or otherwise, that can solve those problems. They have to assume the primary responsibility to govern themselves.

Rising sea levels, severe draughts, the melting of the polar caps, the more frequent and devastating natural disasters all raise demand for humanitarian assistance and disaster relief.

I don't engage in hypotheticals.