Former Vice President 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 on Friday attacked 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.) over the cost of his signature "Medicare for All" plan during a debate in New Hampshire.

Biden noted that Sanders likes to say he “wrote the damn bill” on Medicare for All, but “he’s unwilling to say what the damn thing’s gonna cost.”

While Biden has attacked Medicare for All before, his criticism on Friday was more forceful than usual as he fell out of the top tier in Iowa and Sanders and 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 rose.

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Biden pointed to a CBS interview in January when Sanders said “nobody knows” the cost of his Medicare for All plan. The former vice president also said Sanders’s attitude is “we’ll find out later” what the cost is.

Multiple studies have put the cost around $32 trillion over 10 years, a daunting sum.

Sanders countered that total costs would go down for middle class people because they would no longer have to pay premiums and deductibles, which would more than offset the higher taxes to pay for the plan.

Sanders said his plan would “save the average American substantial sums of money,” so that it would be “much less expensive than [Biden's] plan” for the average person.

Biden and Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.) both drew applause from the audience for their attacks on Medicare for All.

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Klobuchar, another moderate along with Biden, noted that Sanders does not have support for his plan even among most Democrats in the Senate.

“Two thirds of the Democrats in the Senate are not on your bill,” Klobuchar said.

Biden also pointed to the struggles Sanders’s home state of Vermont had in trying to implement a state-level Medicare for All system, an idea it dropped in 2014 after the tax increases were deemed too high.

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.), who has taken fire from multiple sides on Medicare for All, tried to relay a more unifying message on the subject.

“We are the Democrats, we are on the side of expanding health care,” she said, while pointing to unilateral action she would take to lower drug prices on her first day in office.