One of the most striking elements of today's threat picture is that plots to attack America increasingly involve American residents and citizens.

But my view is that you need a system at the border. You need some fencing but you need technology. You need boots on the ground. And then you need to have interior enforcement of our nation's immigration laws inside the country. And that means dealing with the employers who still consistently hire illegal labor.

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.

And we ask the American people to play an important part of our layered defense. We ask for cooperation, patience and a commitment to vigilance in the face of a determined enemy.

It's all about who gets to work and making sure they're legally present in our country. And to do that nationally E-verify becomes a key component. It certainly needs to available, effective and as inexpensive as possible and that employer needs to use it as a tool. Some of the arguments that are made about how it works or does not work don't carry much water with me. I've already used it for several years. It works.

You show me a 50-foot wall and I'll show you a 51-foot ladder.

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.