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 said he would release his “very boring” tax returns the day after Thursday’s Democratic presidential debate.

Sanders made the comment in response to a question from CNN moderator Wolf Blitzer at the Brooklyn event.

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“I think we have one that's coming out tomorrow,” the Vermont senator said. “I don't want to get anyone excited. They're very boring tax returns. No big money from speeches, no major investments.

“Unfortunately I remain one of the poorer members of the U.S. Senate,” he said to cheers from the New York crowd.

Democratic front-runner Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE also called on Sanders as well as the GOP presidential hopefuls to release their tax returns.

“There is a long-standing expectation that everybody running release their tax returns,” the former first lady said, adding that she has released 30 years of returns.