On Tuesday the Supreme Court will consider in Maine Community Health Options v. U.S. whether Congress can limit the spending discretion it has previously granted to the executive branch. Four health insurers have sued the government for not making payments they say they are entitled to under the Affordable Care Acts risk corridors. The temporary program was intended to entice insurers to join the ObamaCare exchanges by minimizing their potential losses and giving them time to calibrate premiums and risk pools.