From the August 20 edition of CNN's The Situation Room With Wolf Blitzer:
Video file
REP. DARRELL ISSA: The one thing that we now know is that, as they said, about 300 separate emails, maybe more, contain classified information.
[...]
ISSA: It's not an accident to have 300 emails become retroactively, if you will, determined to be classified.
[...]
WOLF BLITZER: Well my understanding is those 300 emails they are looking at now, that they haven't definitively ruled it was classified information. They're going over it right now. There seems to be a dispute going on between the State Department and other agencies of the U.S. government what should have been classified, even if it had not been classified at the time. Is that your understanding as well?
ISSA: Well it is, but I'll give you a little piece of history, during my chairmanship, it was amazing how the State Department classified the most mundane information even when publicly available. In this case it appears as though State would like to say these things were not particularly classified. Well the CIA, and NSA, and other clandestine agencies appear to be appalled that very sensitive information was sent out on her non-government server in an unclassified format.
