Assistant House Speaker Ben Ray Luján (D-N.M.) on Tuesday announced his support for "Medicare for All" legislation, becoming the highest-ranking Democrat to co-sponsor the bill.

The bill from Reps. Pramila Jayapal (D-Wash.) and Debbie Dingell (D-Mich.) now has 112 co-sponsors in the House.

"No individual should ever be denied care or worry about costs when sick. But, for far too many Americans today, that is not the reality," Luján said in a statement.

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"Despite the incredible progress we’ve made because of the Affordable Care Act and Medicaid expansion, we continue to see Americans crushed by the health insurance industry, and health care remains a right that far too many New Mexicans and far too many Americans struggle to gain," Luján said.

Luján, the No. 4 House Democrat and a close ally of Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.), is running for Senate in 2020.

The idea of Medicare for All is gaining ground among progressive Democrats, and is becoming a major issue on the 2020 campaign trail.

There have been two hearings in the House to date, in the Rules Committee and Budget Committee. A hearing in front of one of the main health care panels, the Ways and Means Committee, has yet to be scheduled, but Chairman Richard Neal Richard Edmund NealAARP endorses Democrats' measure to overturn Trump payroll tax deferral Pelosi, Democrats unveil bills to rein in alleged White House abuses of power Rep. Bill Pascrell named chair of House oversight panel MORE (D-Mass.) has said he will hold one.

The Energy and Commerce Committee, which also has jurisdiction over health issues, has declined to hold a hearing, illustrating the divide among House Democrats over the legislation.

While Pelosi supports hearings on Medicare for All, she has declined to voice support for the legislation itself and has raised doubts about the bill, including its price tag. She has also noted she wants to build on her signature legislation, the Affordable Care Act.

Still, Pelosi has not outright opposed Medicare for All, saying that different ideas should be on the table.