Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) quickly moved to correct Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) at the Democratic primary debate in Iowa on Tuesday after he refuted Warren's claim that she was the only candidate onstage to have defeated a Republican incumbent over the last 30 years.

"The men on this stage have lost 10 elections," Warren said, pointing out that she and Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.) were the only candidates onstage who had never lost an election.

"The only person who has beaten an incumbent Republican any time in the last 30 years is me," Warren added.

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"Just to set the record straight, I defeated an incumbent Republican running for Congress," Sanders said later when it was his turn to speak.

"When?" Warren asked.

"1990," Sanders responded as Warren appeared to count in her head. "That's how I won. I beat an incumbent congressman."

"Thirty years ago?" Warren said. "I said I was the only one who's beaten an incumbent Republican in 30 years."

"Well, 30 years ago is 1990, as a matter of fact," Sanders said. "But I don't know that that is the major issue of the day."

Bernie Sanders: Just to set the record straight I defeated an incumbent Republican running for Congress



Elizabeth Warren: Wasn't it 30 years ago... #DemDebate pic.twitter.com/4UhWF6SWcq — The Daily Beast (@thedailybeast) January 15, 2020

Sanders defeated former Vermont Republican Rep. Peter Smith in 1990 to win his House seat. Smith was in his first term.

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The exchange comes amid newfound tension between the Sanders and Warren campaigns.

CNN reported — and Warren confirmed — on Monday that Sanders told her in a private meeting in 2018 that he did not believe a woman could be president.

Sanders disputed the remarks at Tuesday's debate.

"Anyone who knows me knows that it is incomprehensible that I do not think a woman could be president of the United States," he said.