The Imperiled Presidency Presidential Leadership in the 21st Century calls for a dramatic reevaluation of the American presidentampamprsquos role within the separation of powers system. In contrast with claims by academics pundits media and members of Congress Cal Mackenzie offers the contrarian argument that the real constitutional crisis in contemporary American politics is not the centralization and accumulation of power in the presidency the ampampldquoimperial presidencyampamprdquo argument but rather that effective governance is imperiled by the diminished role of the presidency. The product of more than three years of research and writing and nearly four decades of the authorampamprsquos teaching and writing about the American presidency The Imperiled Presidency is the first booklength treatment of the weaknesses of the modern presidency written to be accessible to undergraduates and interested citizens alike.