Comey told the senate committee the Federal Bureau of Investigation reopened the probe after agents discovered additional classified emails forwarded by Clinton aide Huma Abedin to her husband, who was not authorized to view them. Weiner was being investigated over an alleged online relationship with a teenage girl.
Democrats have complained of a double-standard in the way the investigations were treated.
Comey said he has been interviewed by the Justice Department's inspector general as part of an internal investigation into how he, his top deputy and the FBI handled the Clinton case.
"So I authorized them to seek a search warrant, and then I faced a choice".
"I've lived my entire career by the tradition that if you can possibly avoid it, you avoid any action in the run-up to an election that might have impact, whether it's a dogcatcher election or president of the United States". So, to speak would be really bad. "To not speak about it would require an act of concealment in my view", Comey said. Well, how stupid do they think we are?More news: Windows to play nicely with Android, iOS
But I think Comey was in a devilishly hard position in the Clinton case, one forced upon him by the poor judgment of his superiors in the Justice Department.
"I had to tell Congress that we were taking these additional steps", he continued. Two actions: speak or hide. I would make the same decision. "I would not hide that from Congress".
He also took time to blast WikiLeaks, which US officials say abetted Russia's campaign interference operation by publishing stolen documents from the Democratic National Committee which embarrassed Clinton.
Under questioning from Democratic Senator Patrick Leahy, Comey said he did not treat disclosures about investigations into Clinton's emails differently than potential connections between the Trump campaign and Russian Federation.
The FBI had already concluded that Russian intelligence hacked into Democratic computer systems and email accounts. "The election took place, Secretary Clinton lost and I just can't believe what happened".More news: Obama to deliver keynote speech in Italy on food security
The committee also wants to examine leaks to the news media and the use of wiretapping as an investigative tool.
"You had some of the Russia's greatest criminal hackers and intelligence agency hackers working together", he said. Charles Grassley, R-Iowa, right, and the committee's ranking member Sen.
For those trying to explain how We the People ended up with President Donald Trump, the easiest, and surest, answer is this: Hillary Clinton.
A spokesman for the California Democrat, Tom Mentzer, would not discuss Feinstein's remarks nor say whether she was offering an estimate or disclosing information she learned from the Federal Bureau of Investigation.
Clinton during an interview Tuesday insisted, "I was on my way to winning until the combination of Jim Comey's letter on October 28 and Russia Wiki- Leaks [of her campaign emails] raised doubts in the minds of people who were inclined to vote for me but got scared off". "If the election had been on October 27, I would be your president", she said, while also putting responsibility for her loss on her own actions. The phony Trump/Russia story was an excuse used by Democrats as justification for losing the election. "I cant consider for a second whose political fortunes will be affected", he said, a day after both the sitting US President and the 2016 Democratic presidential nominee sharply criticised him for his role in the outcome of last years presidential election.More news: NHL Playoffs: Minus Crosby, Penguins Edge Capitals to Take 3-1 Lead
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