The existence of the emails was confirmed before a federal judge on Monday, during a hearing with the conservative group Judicial Watch who is seeking the release of the emails in a public records lawsuit. The 14,900 new documents equal roughly 50% of what had willingly been turned over to the State Department by Clinton's lawyers in 2014.

When asked for her emails by the department, Clinton had a team go through them and permanently deleted any that were considered "personal." They ultimately deleted more emails than they handed over, with no third party or impartial group overseeing the deletions.

The Washington Post has reported that all of the new emails were messages sent directly to or from Clinton herself, not just email chains she was looped in on — as in previous disclosures.

The group is fighting for the emails to be turned over prior to the election in November, but the president of Judicial Watch believes that the State Department is trying to stonewall them and delay the release.