Attorneys for a former aide to John Edwards are seeking more information from the two-time presidential contender for a lawsuit involving a purported sex tape.
A motion filed by Andrew Young's lawyers on Thursday seeks more details from Edwards.
That comes just a couple of weeks after an attorney for Young said Edwards had privately testified in the case.
The filing does not say why Young's side wants more evidence.
Most of the document was filed under seal because of a protective order keeping details confidential.
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A judge previously ordered that details of Edwards' deposition remain private.
Edwards' former mistress Rielle Hunter has sued Young to reclaim materials including a video that Young has said depicts a sexual encounter involving Edwards.
Edwards was the Democratic nominee for vice president in 2004 and campaigned for the Democratic presidential nomination in 2004 and 2008.
Grand jury investigation
Edwards has been the subject of a grand jury investigation over the affair for two years.
Last month, NBC News reported that prosecutors believe they have a strong case, but have not yet gotten a green light from the Justice Department to charge him.
That case hinges on whether Edwards violated election laws by trying to cover up his affair with Hunter.
Sources close to the investigation told NBC News that Justice Department attorneys were conducting a final review of evidence.
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“It would be surprising now if he wasn’t indicted,” said Stephen Saltzburg, a former federal prosecutor and George Washington University law professor. “If John Edwards was aware that money was being paid to hide his mistress... and it was done to help his campaign, then he’s in trouble.”
Edwards has repeatedly said that he did nothing wrong, and a spokesperson said he remains optimistic that the investigation will confirm that.
Federal prosecutors are trying to prove Edwards had a hand in the payment of more than $1 million provided by two key supporters.
The money was allegedly used, according to sources, to keep Hunter quiet and out of sight.
Prosecutors are examining whether the money spent on Hunter should have been treated and reported as campaign contributions, since keeping her way from the press was crucial to Edwards remaining a viable candidate.
NBC News and The Associated Press contributed to this report.