Presidential candidate and Montana Gov. Steve Bullock Steve BullockCourt removes Pendley from role as public lands chief On The Trail: Making sense of this week's polling tsunami McConnell locks down key GOP votes in Supreme Court fight MORE (D) blasted former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE for reversing his stance on super PACs.

Bullock called out Biden after reports emerged that his former aide filed paperwork to form a super PAC a week after the Biden campaign indicated its openness to super PAC money.

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“You don’t ‘Unite the Country’ by buying an election,” Bullock said in the release. “Vice President Biden and I are fighting for similar core values, but as long as super PACs and dark money groups are able to flood our elections with millions of dollars, Washington won’t be able to make true progress on the big issues facing our country.”

The Montana governor called the news about Biden “deeply disappointing.”

“I’ve spent my entire career fighting to get Big Money out of politics, and I’m not going to back down now,” he said in the release.

Bullock also touted his own record in fighting “Big Money,” saying he passed “the most progressive finance disclosure laws in the country,” and he’s been described as the “biggest threat to Citizens United.”

Progressives were also quick to criticize Biden after his campaign signaled that super PAC money might be necessary to defeat President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE. Candidates such as Sens. 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.) and 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.) have vowed not to take money from super PACs, opting instead to fundraise mostly from small donors.

However, Biden defended his stance earlier Tuesday in an interview with MSNBC, saying his campaign’s announcement last week was an “understandable response” for people who want Trump out of the White House.

“His folks are spending an awful lot of money … telling lies about me,” Biden said on MSNBC. “My guess is they would have done the same thing for anybody who was attacked in the Democratic primary if they were leading.”

The Biden campaign did not immediately return a request for comment.