Hillary Clinton failed to release almost 15,000 work-related emails to the Federal Bureau of Investigation as part of its probe into her use of a private server, a conservative legal group said, as the email saga continued to plague the Democratic presidential candidate.

Those emails were expected to be released in the coming months, according to Judicial Watch, the group whose lawsuits against the state department have been the main driver for the revelations surrounding Mrs Clinton’s private email server.

Yesterday Judicial Watch said it was in negotiations with the state department over the release of the 14,900 work emails that had not been previously disclosed. The department agreed that it would appraise the new batch of emails by September 23, after which a schedule would be determined for their release to the public.