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 late Tuesday that she's waiting to see how progressive 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 will be during the likely Democratic presidential candidate’s campaign.

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"A lot of progressives have questions about whether [Clinton] will be a progressive warrior. What would you say to them?" MSNBC's Al Sharpton asked Warren.

"You know - - I think that's what we've got to see," Warren answered. "I want to hear what she wants to run on and what she says she wants to do. That's what campaigns are supposed to be about."

"I'll take it at that," Sharpton responded.

Warren has insisted that she's not running for president, despite progressive groups urging her to enter the race.

Some progressives are concerned that Clinton, the former secretary of State, is too close to Wall Street.

Though Warren signed a letter in 2013 with other female Democratic senators encouraging Clinton to run for president, Warren hasn't been as effusive to Clinton in her public remarks as others in her party.