President Donald Trump's administration has decided not to cover expensive, high-demand obesity treatments under the federal government's Medicare program.

The Centers for Medicare and Medicaid Services said late Friday that it would not cover the medications under Medicare's Part D prescription drug coverage. Medicare covers health care expenses mainly for people age 65 and older.

Trump's predecessor, Joe Biden, proposed a rule in late November after Trump won re-election that would have extended coverage of drugs like Zepbound and Wegovy. The rule was not expected to be finalized until Trump took office.

CMS did not offer an explanation Friday for its decision, and did not immediately respond to a request for comment.

The injectable treatments have exploded in popularity due to the potentially life-changing weight loss that some patients experience. But many insurers, employers and other bill payers have been reluctant to cover the drugs, which can be used by a wide swath of the population and can cost hundreds of dollars a month.

Biden's proposal was expensive: It would have included coverage for all state- and federally funded Medicaid programs for people with low incomes, costing taxpayers as much as $35 billion over next decade.

Proponents of the coverage have argued that treating obesity can actually reduce longer-term costs by cutting down on heart attacks and other expensive health complications that can arise from the disease.

Medicare does pay for drugs like Wegovy for patients who have heart disease and need to reduce their risk of future heart attacks, strokes and other serious problems. The federal program also covers versions of the drugs that treat diabetes.

More than a dozen state Medicaid programs already cover the drugs.

Trump returned to office in January. The Senate confirmed Dr. Mehmet Oz to lead the Centers for Medicare and Medicaid Services on Thursday.

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