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.

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.

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

In our counterterrorism cases and our counterintelligence cases, we can issue all kinds of - of layers of approval in the FBI, a national security letter to find out the subscriber to a particular telephone number and to find out what numbers that telephone number was in contact with. Not the content of those communications, but just the connection.

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.

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.

The FBI also discovered several thousand work-related e-mails that were not in the group of 30,000 that were returned by Secretary Clinton to State in 2014... I should add here that we found no evidence that any of the additional work-related e-mails were intentionally deleted in an effort to conceal them.