US presidential candidate Hillary Clinton and her allies have intensified attacks on Mr James Comey after reports emerged that the FBI director had defied the Justice Department by alerting lawmakers to a potential new batch of messages from her private e-mail server.
Mrs Clinton's campaign hopes its unusually swift response to the fresh investigation by the Federal Bureau of Investigation will blunt the political damage amid concern about the fate of close Senate races as well as the presidential election.
She called the revelation timed so close to Election Day "strange" and "deeply troubling", while opponent Donald Trump labelled it "the biggest political scandal since Watergate".
Mrs Clinton's campaign challenged Mr Comey to quickly release more details on his finding, as analysts said the team had determined that no big disclosure would be made with only a few days to go before the vote.
Analysts said the campaign may be taking a risk in publicly criticising Mr Comey, but the pushback has boosted confidence among Democrats sceptical of Mrs Clinton in the e-mail scandal.
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