Our investigation looked at whether there is evidence classified information was improperly stored or transmitted on that personal system, in violation of a federal statute making it a felony to mishandle classified information either intentionally or in a grossly negligent way, or a second statute making it a misdemeanor to knowingly remove classified information from appropriate systems or storage facilities.

Our focus is and should be on the leakers, not those that are obtaining it as part of legitimate newsgathering.

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.

Our process inside the United States government has gotten much better at making sure we touch all possible source of information about a refugee. The interview process has gotten more robust, so we've gotten our act together in that respect. The challenge remains, especially with respect to folks coming from Syria, we're unlikely to have anything in our holdings. That is, with people coming from Iraq, the United States government was there for a very long period of time. We had biometrics, we had source information. We're unlikely to have that kind of picture about someone coming from Syria.

Really bad people around the world, because of the genius of American innovation, use our products and infrastructure for their emails, for their communications.

If conduct is intentional, it could subject some of the criminal liability.

She [Hillary Clinton] used her personal email extensively while outside the United States, including sending and receiving work-related emails in the territory of sophisticated adversaries.