This latest ding for Clinton is the discovery of an exchange with David Petraeus, who was in charge of the U.S. Central Command at the time.
While the content of the emails is relatively mundane enough — CNN reports it was simply Petraeus and Clinton getting to know each other — the problem here is with timing.
Clinton's camp says she only started using her private email server — firstname.lastname@example.org — in March 2009. Before that, she used an account she no longer has access to. (Video via Hillary for America)
But this email chain was from Jan. 10, 2009 to Feb. 1, 2009 — and some of the later emails were on her hdr22 Clinton email account. For some, this could make her March 2009 claim slightly more murky.
This revelation likely won't help Clinton's campaign, which has been dogged by questions about her email. (Video via Hillary for America)
"That was a mistake, I'm sorry about that, I take responsibility. And I'm trying to be as transparent as I possibly can," Clinton said during an ABC interview.
The latest batch of Clinton emails will be released at the end of September.
This video includes images from Getty Images and music by Chris Zabriskie / CC by 4.0.