As part of our layered approach, we have expedited the deployment of new Advanced Imaging Technology (AIT) units to help detect concealed metallic and non-metallic threats on passengers. These machines are now in use at airports nationwide, and the vast majority of travelers say they prefer this technology to alternative screening measures.

All images generated by imaging technology are viewed in a walled-off location not visible to the public. The officer assisting the passenger never sees the image, and the officer viewing the image never interacts with the passenger. The imaging technology that we use cannot store, export, print or transmit images.

We are on the lookout for criminal and terrorist activity but we do not nor will we ever monitor ideology or political beliefs. We take seriously our responsibility to protect civil rights and liberties of the American people, including subjecting our activities to rigorous oversight from numerous internal and external sources.

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.

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.

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.

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