(CNN) The House Democrats' divide over health care will be on full display Tuesday, when leaders plan to fulfill their midterm election promise by rolling out comprehensive legislation to strengthen the Affordable Care Act.

The bill aims to protect people with pre-existing conditions, as well as lower health care costs and reverse the Trump administration's moves to weaken Obamacare. House Speaker Nancy Pelosi, along with several committee chairs and freshman lawmakers, are set to unveil the legislation at a public event designed to mark the ninth anniversary of the signing of the landmark health care law.

"Medicare for All" plan, a version of which was introduced by Reps. Pramila Jayapal of Washington and Debbie Dingell of Michigan last month and has more than 100 co-sponsors. What's not in the bill? Anything resembling a universalplan, a version of which was introduced by Reps. Pramila Jayapal of Washington and Debbie Dingell of Michigan last month and has more than 100 co-sponsors.

Pelosi acknowledged the goal of universal health care in a statement over the weekend, saying: "As we mark the 9th anniversary of the Affordable Care Act, we reaffirm our commitment to this fundamental truth: that health care must be a right, not a privilege, for all Americans."

leaders continue to slow walk the so-called "single payer" programs, in which the federal government would have an expanded role in health care. But partyleaders continue to slow walk the Medicare for All bill through the House. No hearings are scheduled, though the Rules and Budget committees have said they would hold hearings on the concept ofso-called "single payer" programs, in which the federal government would have an expanded role in health care.

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