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 attacked the progressive left and appeared to suggest that Sen. Mitt Romney Willard (Mitt) Mitt RomneyMomentum growing among Republicans for Supreme Court vote before Election Day Toobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote The Memo: Court battle explodes across tense election landscape MORE (R-Utah) could have made a better president than former President Obama in audio obtained by CNN.

In audio from a private 2016 event obtained by CNN's KFile, the former mayor suggested that Romney would have made a better president than Obama in 2012 had the Republican candidate pledged to govern as he did while governor of Massachusetts.

"The second Obama election I wrote a very backhanded endorsement of Obama," Bloomberg said in 2016 of his prior endorsement of Obama for reelection. "Saying I thought he hadn't done the right thing, hadn't done, hadn't been good at things that I think are important and Romney would be a better person at doing that. But Romney did not stick with the values that he had when he was governor of Massachusetts."

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A spokesman for the Bloomberg campaign told CNN in response to the reported comments that Bloomberg was making an "important" point about his work to convince moderates to support Obama.

"Regarding President Obama, he was making an important point," said Bloomberg's spokesman. "Everyone who read Mike's endorsement of President Obama saw that it was aimed at convincing Americans who saw merit in both candidates to vote for Obama."

"What Mike could and did do for President Obama is much like what he could and did do for 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 when he spoke at the Democratic Convention in 2016 — convince Americans who weren't already convinced of voting for the Democrat," the spokesman added.

Elsewhere in his remarks, Bloomberg quipped that any campaign he launched for president would be about his desire to "defend the banks," a comment a Bloomberg spokesman told CNN was made in jest.

"Well, to start, my first campaign platform would be to defend the banks, and you know how well that's gonna sell in this country," Bloomberg apparently joked.

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Joking or not, the former mayor also took aim at his fellow 2020 contender 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.), a top critic of the U.S. banking system, with a more serious tone in his speech.

"The left is arising. The progressive movement is just as scary," Bloomberg said in the audio. "Elizabeth Warren on one side. And whoever you want to pick on the Republicans on the right side?"

Bloomberg faced heavy criticism from Warren and other Democratic candidates in last week's Democratic debate over his past comments critical of ObamaCare and the Obama administration as well as policies he pursued during his tenure as mayor of New York City, including stop and frisk. He remains a top contender in several upcoming primary states.