Supreme Court justices on Tuesday appeared sympathetic to health insurers' arguments that the federal government owes them billions of dollars after reneging on a promise to fund an Obamacare program.

Health insurers say they'd been subjected to a "bait and switch" that led to shortfall of over $12 billion in an Obamacare stabilization program, which was included in the law to encourage companies to sell coverage in the newly overhauled individual insurance markets. They say the government promised to fund the program, known as risk corridors, when it passed the 2010 law, though later Congresses blocked the payments through spending bills.

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