Comey said the Russian government has for years tried to weaken public faith in democratic processes around the globe, and recently has resorted to more sophisticated tactics.
He was asked at a Newseum event yesterday night what Americans could do to protect against the meddling of a foreign government in politics.
His response: "The most important thing to be done is people need to be aware of the possibility that what they're reading has been shaped by troll farms, looking to push a message on Twitter to undermine our confidence" about the electoral process.
Part of the goal was to spread information to "denigrate" Democratic presidential nominee Hillary Clinton, who lost the November election, according to the report.
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The FBI is investigating, including whether the Kremlin coordinated with Trump campaign associates.
During a question-and-answer session, Comey said the FBI would do everything it could to "identify, investigate and then call out foreign efforts" to influence an election. "One of the most important things we can do is be transparent about efforts to interfere with our process."
His remarks about the Clinton case at a July news conference came after the FBI had concluded the investigation and determined that charges were not warranted.
When Comey wrote Congress in October to say newly discovered emails had been found that needed to be reviewed, he said he was following a pledge to lawmakers to update them on new developments.
Last night, he acknowledged the FBI "did a lot last year that confused people."
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