Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) will unveil his “Medicare for all” bill on Wednesday, his office announced Friday.

The announcement comes as single-payer health care is gaining as a force within the Democratic Party, and Sanders’s formal announcement will move the issue further into the spotlight.

Sanders made single payer a driving force of his campaign for president last year, and is now keeping up the push.

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The advisory from his office says that Sanders will be joined by Senate co-sponsors, though does not list who they are. He will also be joined by “medical professionals, business leaders, and patients.”

The issue has emerged as a key test for 2020 Democratic presidential hopefuls. Sen. Kamala Harris Kamala HarrisHarris honors Ginsburg, visits Supreme Court The Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump MORE (D-Calif.), a possible candidate, recently announced that she would back Sanders’s bill.

Other potential Democratic presidential candidates will also face pressure to take a position on the measure.

The announcement comes as some in Congress are trying for a much narrower bill aimed at simply stabilizing ObamaCare markets.

The Senate health committee is in negotiations over a bipartisan bill that would fund key ObamaCare payments to insurers while also possibly granting more flexibility to states to change regulations under the health law.

Sanders sits on that committee, and used part his time at a hearing on Thursday to call for health care for all.

Separately, a handful of Republicans are not giving up on repeal of ObamaCare, looking to pass a bill from GOP Sens. Bill Cassidy William (Bill) Morgan CassidyCoushatta tribe begins long road to recovery after Hurricane Laura Senators offer disaster tax relief bill Bottom line MORE (La.) and Lindsey Graham Lindsey Olin GrahamMomentum growing among Republicans for Supreme Court vote before Election Day Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Warning signs flash for Lindsey Graham in South Carolina MORE (S.C.) to convert current ObamaCare spending into a block grant to states. That effort faces long odds, though.

—Updated at 2:44 p.m.