Successive presidents have interpreted the FederalVacancies Reform Act of 1998 to authorize the appointment ofprincipal officers on a temporary basis. Despite serving in amere “acting” capacity and without the Senate’s approval, theseacting principal officers nevertheless wield the full powers ofthe office. The best argument in favor of this constitutionallydubious practice is that an acting principal officer is not reallya “principal officer” under the U.S. Constitution because sheonly serves for a limited period. Although not facially specious,this claim elides the most important legal fact: an actingprincipal officer may exercise the full powers of the office, justlike a Senate-confirmed cabinet officer. This approach broadlyvindicates A...