White House hopeful 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 called "Medicare for All" political suicide for Democrats in an op-ed Thursday, urging members of his party not to campaign on the health care policy.

"Medicare-for-all is bad policy for the country and bad politics for the Democratic Party. The Democratic nomination for president shouldn’t go to anyone who supports it, and Medicare-for-all shouldn’t be in the party’s 2020 platform," the former Maryland congressman who frequently polls near 1 percent nationally wrote in The Washington Post.

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"It is political suicide. If the Democratic Party emerges as the party that closed hospitals and made millions of people shift out of a health-care plan they like, the electoral cost will be severe," Delaney continued.

Delaney's op-ed comes days after he slammed Medicare for All at the California Democratic Party convention in San Francisco over the weekend.

"Medicare for All may sound good, but it's actually not good policy nor is it good politics," he told the liberal voters to a chorus of boos.

Former Colorado Gov. John Hickenlooper John HickenlooperCook Political Report shifts Colorado Senate race toward Democrat Willie Nelson playing at virtual fundraiser for Hickenlooper Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' MORE (D) was also booed for blasting Medicare for All during the event.

Fellow 2020 contender 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.) has previously taken heat for criticizing the health care proposal.

A significant portion of the 24 2020 candidates have shown support for Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE's (I-Vt.) Medicare for All proposal that he first championed during his 2016 presidential campaign.

The House version of Medicare for All, sponsored by Rep. Pramila Jayapal Pramila JayapalDHS opens probe into allegations at Georgia ICE facility Progressive Caucus co-chair: Whistleblower complaint raises questions about 'entire detention system' Buttigieg, former officials added to Biden's transition team MORE (D-Wash.), has 110 Democratic co-sponsors.

The Senate version sponsored by Sanders is backed by 14 senators, including four who are running for president.