The Supreme Court on Friday upheld the structure of a federal health task force that recommends preventive medical services that must be provided to patients at no cost.

The U.S. Supreme Court is expected to rule on Friday on the legality of a key element of the Obamacare law, formally called the Affordable Care Act, that helps guarantee that health insurers cover preventive medical care such as cancer screenings at no cost to patients.

The challengers argued that members of the Preventive Services Task Force were improperly appointed because they were not approved by the Senate.