The Democratic leader in the US Senate says the head of the FBI may have broken the law by revealing the bureau was investigating emails possibly linked to Hillary Clinton.
Harry Reid accused FBI director James Comey of violating an act which bars officials from influencing an election.
News of the FBI inquiry comes less than two weeks before the US election. Meanwhile, the FBI has reportedly obtained a warrant to search a cache of emails belonging to a top Clinton aide.
Emails from Huma Abedin are believed to have been found on the laptop of her estranged husband, former congressman Anthony Weiner.
The FBI believes the emails might be “pertinent” to its previous inquiry into Mrs Clinton’s use of a private server when she was secretary of state in the Obama administration.
The case was closed in July without any charges being brought against Mrs Clinton.
Mr Weiner is subject to a separate investigation on suspicion of sending sexually explicit messages to an underage girl.
‘Partisan actions’
In a letter, Mr Reid accused Mr Comey of practising double standards with the intention of helping one political party over another.
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