More Hilary Clinton emails from her time as Secretary of State could be released just before the presidential election in November.
A judge has ordered the State Department to review nearly 15,000 extra mails which have come to light in the now-closed investigation into her handling of sensitive material.
A spokesman for the department said some of them
could merely be duplicate ones.
The FBI recently cleared Clinton of criminal conduct but found her “extremely careless” in her use of a personal server for classified information.
The disclosure of further emails could provide more ammunition for opponents who have seized on the issue to argue that Clinton is untrustworthy for the job as president.
Clinton, who leads her Republican rival Donald Trump in opinion polls, has said she did not compromise classified information and used a private server for convenience. She later apologised, saying: “I take responsibility.”