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) said Friday that she's "not going there" when asked about Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE's recent comments that "nobody likes" Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.).

“Bernie and I have worked together for a very long time and we continue to do so,” Warren told "CBS This Morning" anchor Gayle King Gayle KingFauci: Lack of masks at Trump rallies frustrating The Hill's Morning Report - Presented by Facebook - Trump, GOP senators at odds over next stimulus bill Minneapolis police union says members have been 'scapegoated by political leaders' MORE when asked about the relationship between the two 2020 Democratic rivals. “I’ve said all I’m going to say about that.”

But when King followed with a question regarding Clinton’s allegation that “nobody likes” Sanders in Congress, Warren refused to defend the Vermont senator.

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“I’m not going there,” she said.

Warren has said that Sanders told her in a private meeting in 2018 that he didn’t think a woman would win the White House and has accused him of calling her a "liar on national TV" after he denied it during a Democratic primary debate.

Warren has fallen in the polls in recent months and now stands at 14.6 percent support in the RealClearPolitics index of polls. On Oct. 9, she was at 26.8 percent in the polling average and essentially tied with the national front-runner, former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE.

King also asked Warren about the limits placed on campaigning as the Senate impeachment trial continues with the Iowa caucuses just 10 days away.

“Some things are more important than politics,” Warren replied. “But I’m doing my best. I’m here in Washington because that’s my constitutional responsibility.”