Responding to criticism from Hillary ClintonHillary Diane Rodham ClintonTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada MORE that he has been too critical of President Obama, Bernie SandersBernard (Bernie) SandersTrump's trade war — firing all cannons or closing the portholes? The Hill's 12:30 Report — Trump rips 'ridiculous' spending bill | FBI dragged into new fight | Latest on Maryland shooting Poll: Most Massachusetts voters don't think Warren should run for president in 2020 MORE on Thursday night noted she once faced off with him in a presidential race.

"One of us ran against Barack ObamaBarack Hussein ObamaFord taps Obama, Clinton alum to navigate Senate hearing McCaskill to oppose Kavanaugh nomination Presidential approval: It's the economy; except when it's not 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.