Secretary Hillary Clinton used several different servers and administrators of those servers during her four years at the State Department. She also used numerous mobile devices to send and to read email on that personal domain.

We're conducting an investigation to understand whether there was any coordination between the Russian efforts and anybody associated with the Trump campaign.

We all love privacy. We all care about public safety. And none of - at least people that I hang around with, none of us want back doors. We don't want access to devices built-in in some way.

Our need for public safety and our need for privacy are crashing into each other and we've got to sort that out.

Half of the devices that we encounter in terrorism cases, in counterintelligence cases, in gang cases, in child pornography cases, cannot be opened with any technique. That is a big problem. And so the shadow continues to fall.

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

It is a little bit difficult to talk about things that do involve classified matters in public. But I think the public needs to know that there are multiple oversight layers, including the FISA Court, congressional oversight, internal oversight within the FBI and intelligence community, that protects Americans from - under - their - their privacy rights while targeting terrorists and people who are trying to kill us.