The visa lottery system poses a national security threat. Under the program, each successful applicant is chosen at random and given the status of permanent resident based on pure luck.

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.

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

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