Sen. Steve Daines (R-Mont.) wants Democrats to show their cards on single-payer healthcare.

The GOP senator has filed an amendment to implement a government-funded healthcare system in a political maneuver aimed at forcing Democrats to say whether they support the concept that is picking up steam on the left.

A vote on the amendment has been scheduled for Thursday.

It’s almost certain Daines doesn’t support a single-payer system.

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The vote would be part of the ObamaCare repeal bill vote-a-rama — a rapid succession of amendments that can last hours, oftentimes stretching through the night and into the next early morning. Vote-a-ramas are often a time when senators force their colleagues across the aisle to take tough votes, which can be turned into political attack ads later.

During the 2016 Democratic presidential primary, Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.) championed the idea of "Medicare for All."

It’s gained traction as more Democratic candidates have embraced the idea. Recently, senators such as Elizabeth Warren Elizabeth WarrenJudd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? MORE (D-Mass.) and 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 (D-N.Y.) have rallied around universal coverage. And a Medicare-for-all bill in the House has already garnered 115 co-sponsors, which is almost double the amount the legislation received last congressional session.

Senate Democrats have to defend 23 seats next election and another two held by independents who caucus with the Democrats. Those up for re-election include Sens. Jon Tester Jonathan (Jon) TesterPence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Filibuster fight looms if Democrats retake Senate MORE (D-Mont.), Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (D-Fla.), Joe Donnelly Joseph (Joe) Simon DonnellyTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day MORE (D-Ind.) and Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.).

The legislation from Daines appears to be the same language as the Medicare-for-all bill in the House sponsored by Rep. John Conyers (D-Mich.).

But single-payer isn’t a unifying message among Democrats.

“It’ll tend to be an issue that more left-leaning Democrats are willing to embrace,” said Dan Mendelson, president of consulting firm Avalere Health, told The Hill earlier this month.

“In order to embrace that concept, you’ll have to be willing to defend the efficiency and effectiveness of a fully run government system, and there are many Democrats who are not going to do that and there are some who are.”

Yet, healthcare has also divided the Republican conference, fractions which one Democrat said could speed up the timeline of a single-payer system becoming a reality.

“They have made the public more aware of Medicaid than ever before, specifically, and healthcare generally,” Rep. Earl Blumenauer Earl BlumenauerAhead of a coronavirus vaccine, Mexico's drug pricing to have far-reaching impacts on Americans Trump threatens to double down on Portland in other major cities Federal agents deployed to Portland did not have training in riot control: NYT MORE (D-Ore.) said Wednesday at The Hill’s Health Rx: Building Affordability & Access event. “They’ve accelerated the move toward single-payer, probably advancing it by a decade.”

Jordain Carney contributed to this report