The State Department has agreed to review almost 15,000 previously undisclosed emails flagged by an FBI investigation of Hillary Clinton's private email server from her time as Secretary of State, as a federal judge on Monday ordered a rolling review of the materials over the next four weeks, pushing this issue deeper into the 2016 campaign.

In a federal court on Monday, the State Department agreed to do an "appraisal" of the extra documents by September 22, at which time Judge James Boasberg would set a schedule for their public release.

Justice Department lawyer Lisa Olson told the judge that officials do not yet know what portion of the emails were personal, or work-related.

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Credit: Jamie Dupree

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Credit: Jamie Dupree

The order guarantees more legal wrangling about Clinton's email server deep into the 2016 campaign, and was yet another reminder of how Clinton has had difficulty moving on from the issue, even though the FBI has already concluded its investigation with no charges against her.

The Judicial Watch lawsuit is one of several that has had the State Department busy in federal court for months, dealing with Freedom of Information Act requests for Clinton's emails from her time as Secretary of State.

At a campaign rally on Monday night in Akron, Ohio, Trump seized on the email news.

"Now we learn about another 15,000 emails she failed to turn over, and they've just been discovered," Trump said to boos from the partisan crowd.

"And don't forget the 33,000 emails she's already deleted," as Trump argued that Clinton is not fit to run for President, let alone be elected in November.

"A Trump Administration will end the government corruption," Trump declared to cheers. "No one will be above the law."

Trump also used his speech to vow a full investigation into the Clinton Foundation, and its past fundraising from foreign countries.

"I've become increasingly shocked by the vast scope of Hillary Clinton's criminality," Trump said at a rally in Akron, Ohio.