The Supreme Court of the United States is expected to decide this fall whether to let stand an agency’s statutory interpretation that federal preemption of state consumer protection laws applies not only to national banks but to their operating subsidiaries as well. A decision by the high court will bring clarity to a gray area of federal preemption in which courts have given way to the Office of the Comptroller of the Currency’s controversial reading of the National Bank Act as regards to its exclusive authority to regulate...