This book is the first to undertake a detailed historical and legal examination of presidential power and the theory of the unitary executive. This theory—that the Constitution gives the president the power to remove and control all policy-making subordinates in the executive branch—has been the subject of heated debate since the Reagan years. To determine whether the Constitution creates a strongly unitary executive, Steven G. Calabresi and Christopher S. Yoo look at the actual practice of all forty-three presidential administrations, from George Washington to George W. Bush. They argue that all presidents have been committed proponents of the theory of the unitary executive, and they explore the meaning and implications of this finding.