State Department officials have agreed to release previously deleted emails that FBI agents recovered from Hillary Clinton's private server, according to the watchdog group that sued for the documents.

"The American people will now see more of the emails Hillary Clinton tried to hide from them," Judicial Watch President Tom Fitton said Tuesday. "Simply put, our lawsuits have unraveled Hillary Clinton's email cover-up."

Clinton's deleted emails have been a subject of speculation ever since she admitted to conducting all of her email as secretary of state on a private email server. She deleted about 33,000 emails from her server before it was confiscated by law enforcement, and said those emails only contained personal messages, but the FBI recovered thousands of work-related documents from the server in the course of their investigation into her account.

The recovered emails could fill some of the "strange gaps" in her email records — for instance, there is practically no mention of Rosatom, the Russian State Nuclear Agency, in the released messages.

"It is certainly odd that there's virtually no email traffic on this subject in particular. Remember that a major deal involving Rosatom that was of vital concern to Clinton Foundation donors went down in 2009 and 2010," Peter Schweizer, the author of Clinton Cash, noted in Politico.

"Rosatom bought a small Canadian uranium company owned by nine investors who were or became major Clinton Foundation donors, sending $145 million in contributions. The Rosatom deal required approval from several departments, including the State Department."

But the FBI didn't recover all of the deleted emails.

"It is also likely that there are other work-related emails that they did not produce to State and that we did not find elsewhere, and that are now gone because they deleted all emails they did not return to State, and the lawyers cleaned their devices in such a way as to preclude complete forensic recovery," FBI Director James Comey said when he announced that Clinton would not face criminal charges over the email issue.