An aggressor nation or extremist group could gain control of critical switches and derail passenger trains, or trains loaded with lethal chemicals.

Rather than undermining the Palestinian Authority, it is in Israel's interests to strengthen it by... continuing to transfer Palestinian tax revenues and pursuing other avenues of cooperation.

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.

Today, I think the attitude is that governing is not necessarily good politics, and the result is that it's much more partisan and much more divided.

I think the primary message to the world is that the United States is going to remain the strongest military power in the world.

I don't think there's any question that America is safer as a result of the bin Laden operation.

The area of climate change has a dramatic impact on national security.