We need to secure our southern border. Clearly, the southern border is now a nexus between immigration and national security. It's a sieve.

Great countries need to secure their border for national security purposes, for economic purposes and for rule of law purposes.

Clearly, border security has been the top domestic issue of the year, and rightly so. Securing our borders is an essential aspect of our national security.

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.