| Mr Comey has come under fire from Democrats over the move |
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.
The bureau has meanwhile 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.
There are reportedly 650,000 emails to search through on the laptop, making it unlikely investigators can give a verdict on them before election day. Mr Reid also accused Mr Comey of withholding "explosive information about close ties between [Republican candidate] Donald Trump, his top advisers, and the Russian government".
"The public has a right to know about this information. I wrote to you months ago calling for this information to be released to the public," Mr Reid said.
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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.