It would be unwise to say the least, irresponsible of us at the TSA, at the Homeland Security Department not to evolve our technology to match the changing threat environment that we inhabit.

Bob Mueller for the FBI, myself, met with a particular group of executives that have major roles in the so-called ISPs, the Internet service providers, what they could possibly do. We have met with leaders in private industry in terms of the core critical infrastructure of the country as to what they can possibly do with cyber-attacks.

So not only do we need to deal with threats as they emerge, we have to be thinking in anticipation of future threats, and the things we do have to be things that enable the system to continue to work.

Nonetheless, to the extent that terrorists have come into our country or suspected or known terrorists have entered our country across a border, it's been across the Canadian border. There are real issues there.

Each and every one of the security measures we implement serves an important goal: providing safe and efficient air travel for the millions of people who rely on our aviation system every day.

I have long been a proponent of a guest-worker program between the United States and Mexico, and in particular I have proposed that Arizona would be an ideal location for a pilot project.

I've appointed a task force to take a fresh look at the color-code system and whether we should retain it, change it or scrap it.