Sen. Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (D-Calif.) said Sunday that she believes Russia’s attempt to interfere in the United States presidential election had an impact on the ultimate outcome.

“I think that, and I think the FBI, in the October surprise — I call it an October surprise, of announcing a subsequent investigation [into Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE's private email server], did have an impact,” Feinstein told NBC’s “Meet the Press.”

“And I believe the Clinton people believe it did, too. They were polling and they were up, and all of that diminished.”

Democrats have blasted FBI Director James Comey's letter to lawmakers just before the election that said the FBI had obtained additional information potentially relevant to the investigation.

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Earlier this month, the intelligence community issued a report that concluded Russian President Vladimir Putin called for an influence campaign aimed at helping then-GOP nominee Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE win the White House.

"We did not make an assessment of the impact that Russian activities had on the outcome of the 2016 election. The US Intelligence Community is charged with monitoring and assessing the intentions, capabilities, and actions of foreign actors; it does not analyze US political processes or US public opinion,” the report said.

But Feinstein, the ranking member of the Intelligence Committee, said "I do. I believe that" Russia's interference altered the outcome of the election.

In a closed briefing Friday, former Democratic National Committee (DNC) chairwoman Rep. Debbie Wasserman Schultz (D-Fla.), who was forced to resign last summer as head of the DNC amid the hacking scandal, confronted Comey over his handling of the organization infiltration.

Feinstein said Sunday that she was not prepared to say Comey should be fired.

“Not yet,” she said, when pressed by NBC’s Chuck Todd.