The Short of It:
Notes from interviews conducted during the FBI investigation into Clinton's email practices, reveal that the Undersecretary of State, Patrick Kennedy, attempted to convince FBI officials that some of the emails should be declassified.
The Longer Version of It:
First, let's back it up:
Last year, Clinton's email practices came to the forefront of an investigation into her role in the 2012 Benghazi attacks. The Democratic nominee's use of a private email server while she was secretary of state came to light and led to questions as to whether she mishandled classified information. After the FBI conducted an investigation, they announced earlier this year despite having been "extremely careless," Clinton hadn't crossed any legal lines. The issue seemed to be resolved until, notes from the investigation were released yesterday.
The released documents reveal that last year, Patrick Kennedy, a State Department official had attempted to offer a "quid pro quo" to the FBI in exchange for declassifying one of Clinton's emails. The offer was seemingly made in an attempt to make it appear as if Clinton hadn't actually had as much classified information on her private server as officials suspected. The notes suggest that Kennedy would approve an FBI request for more personnel in Iraq. Whether it was the State Department or the FBI who asked to exchange favors first is unclear, but the State Department has so far been emphatic in denying that they'd ever suggested such an exchange or that an email had ever been declassified.
The news comes out just in time for the third and final presidential debate being held tomorrow, where you can expect a lot of "excuse me"s and prodding about "emails" from Trump.