There wasn’t much mention of the interpretation and enforcement of the Real Estate Settlement Procedures Act during oral arguments this week before the U.S. Court of Appeals for the District of Columbia Circuit in PHH Corp. v. Consumer Financial Protection Bureau. Instead, nearly all of the discussion revolved around constitutional questions. The biggest issue was about just how much power to “faithfully execute” the laws of United States the president is left with if the only way to remove the head of a single-director agency is “for cause.” The other constitutional issues that garnered some attention were...