House and Senate Democrats on Wednesday introduced a Medicare buy-in bill, legislation that they presented as an alternative to the single-payer proposals backed by the progressive wing of the party.

The new measure would allow people to purchase Medicare plans after turning 50, instead of waiting until 65. Supporters say it’s more politically palatable and easier to implement than “Medicare for all,” which would upend the entire health care system.

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“This is something that is not pie in the sky or aspirational,” said Rep. Joe Courtney Joseph (Joe) D. CourtneyConnecticut Republican drops out of congressional race on primary day after arrest Navy recommends reinstating Crozier as captain of USS Theodore Roosevelt: report Overnight Defense: Aircraft carrier captain removed from duty after pleading for help with outbreak | Trump to expand use of defense law to build ventilators | Hospital ships receiving few patients MORE (D-Conn.), a co-sponsor of the buy-in bill. “This is a piece of legislation where you could turn the switch on overnight.”

The measure was introduced by Sens. Sherrod Brown Sherrod Campbell BrownSenate Democrats release report alleging Trump admin undermined fair housing policies Bipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda MORE (D-Ohio), Debbie Stabenow Deborah (Debbie) Ann StabenowOVERNIGHT ENERGY: Trump rollbacks could add 1.8 billion tons of greenhouse gas emissions over 15 years: analysis | Intensifying natural disasters do little to move needle on climate efforts | Experts warn wildfire smoke could worsen COVID-19 GAO report finds brokers offered false info on coverage for pre-existing conditions Democrats back away from quick reversal of Trump tax cuts MORE (D-Mich.) and Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE (Wis.) and Reps. Courtney, Brian Higgins Brian HigginsBiden slams Trump for promoting conspiracy theory about man shoved by police Trump claims 75-year-old man shoved by Buffalo police could be part of 'set up' NY, NJ lawmakers call for more aid to help fight coronavirus MORE (D-N.Y.) and John Larson John Barry LarsonGAO clears way for Democrats to try to overturn Trump's payroll tax deferral Trump payroll-tax deferral for federal workers sparks backlash Military members can't opt out of Trump's payroll tax deferral MORE (D-Conn.).

Meanwhile, progressive House Democrats are preparing their Medicare for all bill, which would largely eliminate the private insurance industry and move everyone into a single-payer, government-run system.

“I have respect for people that are trying to find other ways to go forward,” said 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.), who plans to introduce Medicare for all legislation at the end of the month, followed by a hearing in the House Budget Committee in late March or April.

“But you know, I think what we’re proposing is really a transformation of the health care system to get out the pieces that are so embedded into it that continue to make health care costs equivalent to 19 percent of the GDP. We’ve got to get at those costs,” said Jayapal, a co-chair of the Congressional Progressive Caucus.

For some, Medicare buy-in is a reasonable step toward universal health care or Medicare for all.

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“I’ve always supported universal health care, but we are not there yet,” said Baldwin, who is also a co-sponsor of Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE’s (I-Vt.) Medicare for all bill.

“Medicare at 50 is a very bold step in the right direction,” she said.

The buy-in bill would leave the American health care system intact, while Medicare for all would largely do away with the private market where 50 percent of the population gets coverage through work.

But some Democrats are wary undoing the existing infrastructure, as highlighted by the response to presidential candidate Sen. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE’s (D-Calif.) comments last month about “eliminating” private insurance via Medicare for all.

“We’ve got an employment-based system that a lot of people depend on,” Larson said. “[Buy-in] would accommodate that. That’s what makes so much sense about this.”

Like-minded supporters argue it is the most popular approach out there and could lead to universal care further down the line.

A recent Kaiser Family Foundation poll found 77 percent of Americans support a Medicare buy-in approach for adults between the ages of 50 and 64.

“I think it’s good in and of itself because it would provide the protection of Medicare now, and it could be a pathway to something greater,” Higgins said. “The most important thing to keep in mind is the ACA has not been improved since inception. This is the next improvement of the Affordable Care Act.”

Any expansion of Medicare is unlikely while Republicans control the Senate and White House. But the looming 2020 elections have intensified the debate about health care among Democrats, especially since they credit the issue as a key reason why their party won back the House in the 2018 midterm elections.

Divisions over how best to move forward are already apparent among Democrats running, or considering a run, for president.

“We have some colleagues that are supporting this as a first step, and others who are saying, ‘I think this is what we ought to do and have a private marketplace addressing those between 27 and 49,’” Stabenow said. “There are differences of opinion, but the great news is this can be done now and has broad support.”

Almost every Senate Democrat running for president is a co-sponsor of the buy-in bill, including Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (N.J), Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (N.Y.), Harris and Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (Minn.).

Brown, who has said he is considering a White House bid, is also a co-sponsor.

But Brown and Klobuchar, moderate Midwest Democrats, say they aren’t ready to support Medicare for all, while their other colleagues running for president have signed on to the Sanders bill from 2017.

“Eventually we probably get to something like Medicare for all, but we start by expanding it and helping people now,” Brown said Tuesday at a Christian Science Monitor breakfast.

The introduction of various Medicare expansion bills could also create tension between the party and House Democratic leadership, which has tried to keep the caucus united on protecting ObamaCare from legal challenges and “sabotage” from the Trump administration.

As the Democrats introduced their buy-in bill Wednesday, the House Energy and Commerce Committee was holding a hearing on shoring up the ObamaCare marketplace.

The chairmen of the committees with primary jurisdiction over health care issues haven’t agreed to hold hearings on Medicare for all.

Higgins on Wednesday wouldn’t say whether he had a commitment from Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) for a floor vote on his bill, but said they have spoken about “having the bill taken up in some way.”

Both buy-in and Medicare for all are fiercely opposed by outside interests that would stand to lose under both proposals.

“We can all agree that every American deserves access to affordable health coverage and high-quality care, but this proposal — whether you call it Medicare for all, Medicare buy-in, single-payer or a public option — moves us toward a one-size-fits-all health care system that is wrong for America,” said Lauren Crawford Shaver, executive director of the Partnership for America’s Health Care Future, a coalition of industry groups that launched last year to oppose expansion of Medicare.

Updated at 5:50 p.m.