Admiral Michael Mullen: “The national debt was the greatest threat to the national security of the United States.”

I think the biggest threat we have to our national security is our debt.

The prospect of unsecure nuclear weapons or materials, and their acquisition and use by al Qaeda or an affiliate, is a serious threat that DOD addresses in the NMS as well as in our operational planning efforts.

The direction you get from a President in a situation like that is 'Do everything you can.' It's all the guidance that you need.

I have said many times that I believe the single biggest threat to our national security is our debt.