Al-Qa'ida does not follow a traditional command structure, wear uniforms, carry its arms openly, or mass its troops at the borders of the nations it attacks. Nonetheless, it possesses the demonstrated capability to strike with little notice and cause significant civilian or military casualties.

Our democratic values also include - and our national security demands - open and transparent government. Some information obviously needs to be protected. And since his first days in office, President Obama has worked to strike the proper balance between the security the American people deserve and the openness our democratic society expects.

Yes, war is hell. It is awful. It involves human beings killing other human beings, sometimes innocent civilians. That is why we despise war.

I have a reputation for speaking my mind. I like to think my candor and bluntness will give you the answers.

A lot of things look good on an academic's blackboard in terms of the actions that need to be taken. It's almost like a football coach, when you draw the X's and O's: Every play that is chalked on that board goes for a touchdown. Well, there are a lot of yards to be made between the line of scrimmage and the touchdown.

The risk of just one terrorist with just one nuclear weapon is a risk we simply cannot afford to take.

In full accordance with the law - and in order to prevent terrorist attacks on the United States and to save American lives - the United States government conducts targeted strikes against specific al-Qa'ida terrorists, sometimes using remotely piloted aircraft, often referred to publicly as drones.