A move to cover expensive weight-loss drugs for Americans on Medicare and Medicaid may be in the works, but any such program could run into problems with voluntary participation and concerns about expense.

The federal government is expected to start a 5-year-long experiment that will provide some limited coverage of obesity medications.

The Trump administration is considering a five-year pilot program to cover weight-loss drugs under Medicare and Medicaid, the Washington Post reported on Friday, citing documents from the Centers for Medicare and Medicaid Services.