The White House on Monday proposed capping out-of-pocket prescription drug expenses for seniors covered by Medicare, re-emphasizing Trump administration support for a concept endorsed both by pharmaceutical companies and congressional Democrats.

Sen. Bernie Sanders is raising the stakes of the “Medicare for All” debate by expanding his proposal to include long-term care, a move that is forcing other Democratic presidential candidates to take a stand on addressing one of the biggest gaps in the U.S. health care system.

The mysterious new health-care venture announced by Amazon.com Inc., Berkshire Hathaway Inc. and JPMorgan Chase & Co. will be called Haven, the firm announced Wednesday.

Attacking “the secretive nature of pricing in the health care market,” the Trump administration said this week that it wanted to require public disclosure of the rates that doctors and hospitals negotiate with health insurance companies.

The Trump administration is weighing whether to require hospitals to publicly reveal the prices they charge insurance companies for medical procedures and services — prices that are currently negotiated in private and kept confidential.

Democratic leaders in the House are offering warnings about the high cost of "Medicare for all," underscoring concerns in the party about moving forward with the single-payer health care proposal.