Sen. 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.) will join a growing list of Democratic co-sponsors of 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's (I-Vt.) "Medicare for all" proposal, according to a Friday report from Mic.

Gillibrand joins other possible 2020 Democratic White House hopefuls in supporting the bill, including Sens. 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.), 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 (Calif.) and Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (Mass.).

Sanders will unveil the measure at an event on Wednesday. The bill is quickly gaining Democratic support, and the issue of single payer is emerging as a key test for possible presidential contenders.

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Gillibrand expressed some support for single-payer health care in June as well.

"Health care should be a right, it should never be a privilege. We should have Medicare for all in this country," she said, according to CNN.

Gillibrand's office did not respond to a request for comment on the Mic report.