McConnell’s case against the panel is worth a close parse. For one, it’s hardly unusual for Congress to create special commissions to look into such things, if the gravity warrants. Congress opened myriad investigations of the attacks in Benghazi, Libya, in 2012, for instance. You could just as well argue that Congress could have looked into the 9/11 attacks using the regular committee process. But when something rises to a certain level, there has generally been a recognition that something more is warranted.