Hillary Clinton has blamed her defeat in the US presidential election on interventions by the FBI director.
James Comey's announcement of a new inquiry into her use of email while secretary of state shortly before election day had stopped her campaign's momentum, Mrs Clinton said.
The Democratic candidate was speaking to top party donors in a phone call, which was leaked to the media.
Protests are continuing against the victory of her rival, Donald Trump.
About 2,000 people have been marching through the New York borough of Manhattan, to shouts of "not my president", as they head for the skyscraper where the president-elect lives.
American cities have seen nightly protests by activists furious at the property tycoon's controversial policies.
Mr Trump seems to be rowing back on some of his campaign pledges. Having pledged to scrap President Barack Obama's healthcare law dubbed "Obamacare", he now says he is open to leaving intact key parts of the act.
Asked whether he would implement a campaign promise to appoint a special prosecutor to investigate Mrs Clinton over her use of a private email server while secretary of state, he listed healthcare, jobs, border control and tax reform as greater priorities.
The Republican is due to be sworn in on 20 January, taking over from Mr Obama, who will have completed two terms in office.
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