Billionaire philanthropist and presidential hopeful Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE challenged former New York City Mayor Michael Bloomberg Michael BloombergBloomberg rolls out M ad buy to boost Biden in Florida Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Bloomberg pays fines for 32,000 felons in Florida so they can vote MORE to support a wealth tax before joining the crowded 2020 Democratic primary.

“Today, I’m challenging Michael Bloomberg to support a wealth tax or not run for president," Steyer said in a statement. "In order to support progressive policies like universal health care and a Green New Deal, and address the wealth gap in our society, the Democratic nominee in 2020 must support asking the wealthy to pay more."

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"If Michael Bloomberg decides to support a wealth tax, I welcome him to this race," he continued. "If not, it’s very clear that he should not be the Democratic nominee. We cannot afford to have a Democratic nominee in 2020 who does not support asking the wealthy to pay more to address the enormous inequality in our society.”

The statement comes as Bloomberg, a billionaire businessman, is expected to declare himself a candidate in the Alabama presidential primary ahead of the state’s filing deadline Friday.

The entrance of a second billionaire in the Democratic primary could fan the ongoing debate over how far Democrats should go in addressing income and wealth inequities as an increasingly activist base rails against the consolidation of wealth among the richest citizens.

Essentially every Democrat running for president has agreed that wealthier Americans should pay more in taxes, though they sharply differ on policy.

Progressive candidates like Sens. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) have unveiled several plans to rectify economic and racial inequities and fight for various social justice efforts that hinge on boosting taxes on wealthy individuals and corporations. Meanwhile, more centrist candidates have opted for more incremental changes.

Bloomberg has hinted that he may be against some of the more liberal policies, saying earlier this year that Warren’s wealth tax on those worth more than $50 million is “probably unconstitutional.”