Thousands more Clinton emails to be released

The State Department is reviewing almost 15,000 more Hillary Clinton emails that went previously undisclosed during an FBI investigation into her private server.

The emails, which had not been disclosed by Clinton's attorneys, could become public by mid-October, just weeks before Election Day. The State Department is reviewing the documents for classified information.

See photos from Clinton's email scandal

Republicans have called for the quick release of the emails as some states begin early voting just one month from now.

"The process for reviewing these emails needs to be expedited, public disclosure should begin before early voting starts, and the emails in question should be released in full before Election Day," Republican National Committee Chair Reince Priebus said in a statement.

Update: The Clinton campaign released the following statement on the emails: "As we have always said, Hillary Clinton provided the State Department with all the work-related emails she had in her possession in 2014. We are not sure what additional materials the Justice Department may have located, but if the State Department determines any of them to be work-related, then obviously we support those documents being released publicly as well."