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.

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

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

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

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.

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 do assess that hostile actors gained access to the private commercial email accounts of people with whom Secretary Hillary Clinton was in regular contact from her personal account.