Former New York City Mayor Michael Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE referred to Social Security as a “Ponzi scheme” as mayor and called for cuts to the program as well as to Medicare and Medicaid.

"I don't know if Bernie Madoff got his idea from there, but if there's ever a Ponzi scheme, people say Madoff was the biggest? Wrong. Social Security is, far and away," Bloomberg said in 2009 on the radio program “Live from City Hall” in audio reported by CNN’s KFile.

"We are giving monies out with the next guy's money coming in and at the end of — when the music stops — it's just not gonna be enough chairs for everybody," Bloomberg added.

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The remarks could cause problems for the Democratic presidential candidate in a party that has largely abandoned any talk of reforming Social Security through raising the age to receive benefits or making other changes.

Ponzi schemes, named for con artist Charles Ponzi, are fraudulent schemes that involve paying earlier investors with more recent investors’ money and representing it as a return on the investment.

Bloomberg made similar comments between 2010 and 2013, when bipartisan proposals to reduce or restructure social safety net programs were frequently floated as a method of reducing the deficit.

The then-mayor repeatedly called for the passage of the Simpson-Bowles plan, named for former Sen. Alan Simpson (R-Wy.) and former Clinton White House chief of staff Erskine Bowles, who made several suggestions on federal spending as co-chairmen of a deficit reduction commission established by former President Obama in 2010.

While the Simpson-Bowles plan had bipartisan support, it was also condemned on the left for proposed changes to Social Security, including raising the retirement age and increasing the payroll tax cap, and on the right for proposed tax increases.

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Since announcing his run for the White House, however, Bloomberg has attacked President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE for suggesting in January that "at some point" his administration would consider "entitlement cuts" in a second term.

Bloomberg's campaign website reads, "President Trump has suggested that he is open to cutting Social Security, Medicare and Medicaid. As president, Mike will strengthen entitlement programs and supplement the private retirement savings system to ensure that no American senior has to live in the shadow of financial peril."

"Congress can do their part," Bloomberg said in November 2011. "They should just pass this Simpson-Bowles plan of cuts, which was done with an enormous amount of research by a Republican and a Democrat who have great credibility and had wonderful staff. And yes, you probably could make both things better, but these are things where Congress and the president, yes or no, up or down the whole thing or nothing."

Social Security has emerged as a contentious issue already in the Democratic primaries, with 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.) seizing on previous comments by former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE that Sanders said indicated openness to cuts to the program.

The Hill has reached out to the Bloomberg campaign for comment.