Responding to criticism from Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE that he has been too critical of President Obama, 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 on Thursday night noted she once faced off with him in a presidential race.

"One of us ran against Barack Obama Barack Hussein ObamaThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon Trump appointees stymie recommendations to boost minority voting: report Obama's first presidential memoir, 'A Promised Land,' set for November release MORE,” he said at the Democratic primary debate in Wisconsin. “I was not that candidate."

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Sanders, a senator from Vermont, made the remark after Clinton called him out for criticizing Obama and saying he "failed the presidential leadership test."

"Calling the president weak, calling him a disappointment, calling several times that he should have a primary opponent when he ran for reelection in 2012," she said, "I think that goes further than saying 'we have our disagreements."'

Clinton said that while she understands there are policy disagreements, the "personal assessments and charges" Sanders made were "particularly troubling."

Sanders defended himself earlier in the debate, saying he had worked with Obama, and that a U.S. senator has the right to disagree with the president.

Updated at 11:21 p.m.