Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 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 Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) issued a stern warning to the 2020 Democratic primary field that progressive policies that might fire up the party’s liberal wing could prove damaging in the general election.

Pelosi said proposals such as “Medicare for All” and a wealth tax that have been touted by 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.) could appeal to progressive pockets but fail to land in key swing states.

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“What works in San Francisco does not necessarily work in Michigan,” Pelosi said in an interview with Bloomberg News published Saturday. “What works in Michigan works in San Francisco — talking about workers’ rights and sharing prosperity.”

“Remember November,” she added. “You must win the Electoral College.”

While the California Democrat declined to endorse any candidate in the primary race, she unloaded on progressive policies, saying they fail to make inroads with swing voters who backed President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE in 2016.

“As a left-wing San Francisco liberal I can say to these people: What are you thinking?” Pelosi said. “You can ask the left — they’re unhappy with me for not being a socialist.”

The speaker specifically singled out Medicare for All as an example of a policy that may be beyond the pale for moderate voters the party will need to win back next year.

“Protect the Affordable Care Act — I think that’s the path to health care for all Americans. Medicare For All has its complications,” Pelosi said, adding that “the Affordable Care Act is a better benefit than Medicare.”

The comments come as Warren and Sanders remain in the top tier of the primary field, with the Massachusetts Democrat in particular laying claim to the title of front-runner in a series of national and early state polls.

The two progressives have fiercely defended their policies as bold proposals that are needed to shake up the status quo, hinting that their competitors’ policies fail to sufficiently restructure systems they slam as inequitable.

Warren tore into her critics Friday in defense of her Medicare for All plan after some Democrats voiced concerns over its cost.

“Democrats are not going to win by repeating Republican talking points and by dusting off the points of view of the giant insurance companies and the giant drug companies who don’t want to see any change in the law that will bite into their profits,” Warren fired back.

“But if anyone wants to defend keeping those high profits for insurance companies and those high profits for drug companies and not making the top 1 percent pay a fair share in taxes and not making corporations pay a fair share in taxes, then I think they’re running in the wrong presidential primary," she continued.