This, post 9/11, is a situation that we can't explain or can't afford from a national security standpoint,

Energy has become a national security issue and as technology continues to improve, there will be more debates like the one on Keystone.

The academy has been dealing with the issue of scientific openness versus national security since 9/11,

The Bush campaign was all about national security. [Campaign members] implied ... that a vote for Kerry would put you in danger.

We regularly hold terrorists and spies accountable in court while safeguarding both national security and due process. We are confident in the system of justice to try these cases under the procedures adopted by Congress and regularly upheld by the courts.

What is a threat to national security and who determines what is a threat to national security?