Former Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (D-Md.) has doubled down on his opposition to “Medicare for All,” taking a swing at two of his top-tier opponents in the Democratic primary: Sens. 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 (D-Mass.) and 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.).

Warren confirmed her support for Sanders's Medicare for All bill during Wednesday night's debate, where she shared a stage with Delaney and eight other candidates.

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Delaney called Sanders's universal health care plan, which he acknowledged about half of the Democratic field supports, a "disaster."

"Sen. Warren — who has a plan for everything — but has outsourced health care to someone who isn’t even a Democrat," Delaney said in a statement Thursday. “We should not allow Senator Sanders to hijack the Democratic Party and use it as a vessel for his socialist agenda."

The Hill has reached out to the Warren and Sanders campaigns for comment.

Sanders will take the stage on Thursday, along with nine other candidates in the crowded field.

"I hope the moderators give Sen. Sanders an opportunity to reverse course on Medicare for All and support my plan, BetterCare," Delaney said.

Delaney's health care proposal would create a new public health care plan for Americans under the age of 65, and preserve traditional Medicare. It would also keep private insurance options.

Delaney was booed earlier this month at a California Democratic Convention for expressing a similar sentiment, telling voters Medicare for All is "actually not good policy."

Freshman Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn 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 McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.) weighed in after Delaney's comments, suggesting the congressman "please sashay away."