What role does ethics play in American foreign policy? The advent of the Trump Administration has raised this from a theoretical question to front page news. Should ethics even play a role, or should we only focus on defending our material interests? In Do Morals Matter? Joseph S. Nye provides a concise yet penetrating analysis of how modern American presidents have-and have not-incorporated ethics into their foreign policy. Nye examines each presidencyduring the American era after 1945 and scores them on the success they achieved in implementing an ethical foreign policy. Alongside this, he also evaluates their leadership qualities, explaining which approaches work and which ones do not.