Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, 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 MORE (D-Mass.) has joined Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) in critiquing fellow Democratic presidential primary opponent Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE's Social Security record.

Warren appeared united with Sanders on hitting the former vice president's record after a couple of weeks of tension between the two liberal candidates.

“Bernie Sanders and I established the 'Expand Social Security Caucus’ in the Senate,” Warren told Politico. “As a senator, Joe Biden had a very different position on Social Security, and I think everyone's records on Social Security are important in this election.”

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Her remarks follow a back-and-forth between the Biden and Sanders campaign over the moderate front-runner's record and Social Security.

Biden accused Sanders of doctoring a video of the former vice president lauding former Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) for proposing cuts to Social Security and Medicare in 2018, but Politico reported there is no evidence the Sanders campaign altered the video.

The Sanders campaign shot back after the accusation, with campaign manager Faiz Shakir saying Biden “should be honest with voters and stop trying to doctor his own public record of consistently and repeatedly trying to cut Social Security.”

Sanders speechwriter David Sirota later tweeted a separate video of Biden during his time in the Senate arguing for a freeze on federal spending programs like Social Security, Medicare and Medicaid.

A Biden campaign proposal now calls for expanding Social Security.

The Biden campaign declined to comment on Warren’s comments.