Former New Jersey Gov. Chris Christie (R) said Monday that ex-FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE was "the single biggest factor" in shifting momentum toward President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE in the closing days of the 2016 campaign.

Christie said on "The Hugh Hewitt Show" that Comey's decision to reopen an investigation into then-Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE's use of a private email server reshuffled the race after an "Access Hollywood" recording in which President Trump described groping women had dominated headlines for days.

"Did Comey win Donald Trump the election?" Hewitt asked Christie.

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"I believe that Comey was the single biggest factor in changing the momentum after Access Hollywood and before the election," Christie responded.

The former governor, who backed Trump during the 2016 campaign, has been on a media tour in recent weeks to promote his new book. He recalled on Monday telling then-candidate Trump in the final days of the 2016 campaign that in typical elections, whichever candidate was being talked about more heading into Election Day would win.

"But in this race, whoever they were talking about was the one that was going to lose," Christie said. "And because of Jim Comey’s actions, they were still talking about Hillary Clinton. And I think that had a large part to do with his victory and her defeat."

Comey publicly said months before the 2016 election that Clinton would not be prosecuted for her handling of classified information while she was secretary of State. However, he wrote a letter just days before Election Day stating the FBI had uncovered new emails.

Though Comey eventually said no new information was found in the emails, Clinton’s team blamed the letter for her sharp drop in the polls leading up to the election.

Trump fired Comey in May 2017, and has since repeatedly torn into the former FBI director as a "liar" who damaged the bureau's reputation.

Since his ouster, Comey has become an outspoken critic of the president and his defenders in the GOP.