Only a very small number of the e-mails containing classified information bore markings indicating the presence of classified information. But even if information is not marked 'classified' in an e-mail, participants who know or should know that the subject matter is classified are still obligated to protect it.

What we want to work with manufacturers on is to figure out how can we accommodate both interests in a sensible way? How can we optimize the privacy, security features of their devices and allow court orders to be complied with?

In their minds, the murderers and accomplices of Germany, and Poland, and Hungary, and so many, many other places didn't do something evil. They convinced themselves it was the right thing to do, the thing they had to do. That's what people do. And that should truly frighten us.

I care a lot about privacy. I also care an awful lot about public safety. There continues to be a huge collision between those two things we care about.

There are two things that matter in a criminal investigation of a subject.What did the person do, and when they did that thing, what were they thinking? When you look at the hundred-years-plus of the Justice Department investigation and prosecution of mishandling of classified information, those two questions are obviously present.

Sometimes the FBI is assigned to do background checks on people who are coming into government in the executive office of the president. Other times, not. A lot of times there are people who are arriving with clearances that already exist.

I'm in the business where I can't ever say there's no risk associated with someone.