Sen. Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.) slammed Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE's (D-Mass.) "Medicare for All" proposal on Friday, saying the plan is not believable.

“Voters are sick and tired of politicians promising them things that they know they can’t deliver," Bennet said in a statement. "Warren's new numbers are simply not believable and have been contradicted by experts. Regardless of whether it's $21 trillion or $31 trillion, this isn't going to happen, and the American people need health care."

Warren released her highly anticipated Medicare for All proposal on Thursday after pressure from her Democratic presidential rivals.

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Warren's plan does not include a tax hike on the middle class, unlike her progressive rival Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.), who has said tax hikes are needed to help pay for the program.

Warren said that the plan will be paid for by redirecting some funds from states to help fund Medicare. The senator also revealed that the plan would cost an extra $20.5 trillion in new federal spending over 10 years, a lower estimate than the $34 trillion in new spending the Urban Institute had said would be needed.

Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE's campaign also took aim at Warren's plan in a statement, saying it hid the truth from voters on raising middle-class tax cuts.

"The mathematical gymnastics in this plan are all geared towards hiding a simple truth from voters: it's impossible to pay for Medicare for All without middle-class tax increases," Biden's communications director, Kate Bedingfield, said in a statement.