A super PAC supporting Democratic presidential candidate Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE is warning donors of a “doomsday scenario” for the party if they don’t unite behind the former vice president, according to a memo obtained by Politico.

Unite the Country super PAC claims that Biden is the sole candidate that can “unite every corner of the Democratic coalition” to take on President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE in November.

“Donors hedging their bets on Biden because of [Mike] Bloomberg could be creating a doomsday scenario for Democrats everywhere,” the group’s treasurer, Larry Rasky, wrote in the memo, Politico reported. Bloomberg, a billionaire self-funding his campaign, announced he’d be skipping the first four nominating states. Despite his late entry to the race and not having participated in a single debate, the former New York City mayor has been rising in recent polls.

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The memo is dated Saturday, after the caucuses in Iowa, where Biden trailed in fourth place behind Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.), Former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE and Sen. Elizabeth Warren Elizabeth WarrenWarren, 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 No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.)

Rasky also reportedly wrote that the “Sanders-Warren wing of the Party is ready for the Bloomberg fight,” but said that Democrats “cannot afford a split convention.”

“Do you really think the Sanders voters wing will support Mike Bloomberg?” he asked, adding that “it looks like Bernie could consolidate the left quickly” if Warren can’t “close on” the Vermont senator.

Although the memo warns about Sanders as the party's nominee, Rasky also takes a swing at Buttigieg in the memo.

“We all like and respect mayor Pete. He has run a tremendous campaign. However, Democrats run the risk of a realignment of the African American vote if Pete is the nominee,” Rasky wrote.

Spokespeople for Buttigieg, Sanders and Warren were not immediately available for comment.

The super PAC announced last week it would be investing $900,000 on TV and digital ads in New Hampshire ahead of Tuesday's primary. It also said that it started targeted communications to African American and Latino voters in Nevada, and will soon move into South Carolina with radio and digital advertisements.