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.) on Sunday ramped up her criticism of FBI Director James Comey and the letter he sent to Congress in October about then-Democratic presidential candidate 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 emails.

“I think you look before you leap,” Feinstein told NBC’s “Meet the Press.”

“The FBI has a policy of not announcing October surprises. This was 11 days before the election. What he could have done is said, ‘Let’s just be sure. Let’s get a search warrant. Let’s look at the Weiner computer and let’s see what there is.’”

The senator was referencing emails the bureau discovered in late October that it believed may have been relevant to the investigation into Clinton’s private server.

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“And if he did that, he would have the information that, ‘Well, there’s no need for another investigation. We have all this material already,’” Feinstein added.

Comey, just days before the November election, announced that the newly discovered emails would not change the bureau’s recommendation that charges not be brought against Clinton over her use of a private server.

Last week, Comey argued during testimony in front of the Senate Judiciary Committee that he had to disclose the email discovery to Congress right away because concealing it would have been “catastrophic” to the FBI.

But Feinstein on Sunday made clear that she disagrees that Comey only had two options: to conceal the emails or to alert Congress.

“So what he did was authorize what I believe to be a needless investigation ... which I have no doubt and I believe that the Clinton campaign’s poll show this, that it made a big difference,” Feinstein said.

Clinton in a rare public appearance last week cited the Comey letter as one of the reasons for her election loss to President Trump.

“I was on the way to winning until the combination of Jim Comey’s letter on October 28 and Russian WikiLeaks raised doubts in the minds of people who were inclined to vote for me, but got scared off,” she told CNN’s Christiane Amanpour.