U.S. Supreme Court justices on Tuesday appeared sympathetic to claims made by health insurers seeking $12 billion from the federal government under a program set up by the Obamacare law aimed at encouraging them to offer medical coverage to previously uninsured Americans.

The justices heard a one-hour oral argument over a challenge by a group of insurers of a lower court's ruling that Congress had suspended the government's obligation to make such payments. The insurers have said that ruling, if allowed to stand, would let the government pull a "bait-and-switch" and withhold money the companies were promised.

The court's four liberal justices, in addition to Chief Justice John Roberts and Justice Brett Kavanaugh, all asked questions indicating they are inclined to vote for the insurers.