"Arguing Fundamental Rights" offers a comprehensive analysis of Robert Alexy's groundbreaking theory of constitutional rights. The book combines a critical examination of the structural elements of Alexy's theory with an assessment of its practical relevance, particularly concerning the UK Human Rights Act and the protection of fundamental rights in the European Union, both before and after the Charter of Fundamental Rights of 2000. It is distinguished by a sophisticated interpretation of one of the leading European views on fundamental rights and discusses the pragmatics of constitutional jurisprudence. The chapters address central political questions, such as the rationality of rights decisions and the role of judges compared to democratically elected parliaments. Additionally, important legal issues are explored, including the limits of fundamental rights and their binding effect on private parties. Robert Alexy himself opens the book with an insightful contextualization of his theory within his overall legal theory. This publication serves as a contemporary defense of practical reason against the claim that emergencies can justify the restriction of fundamental rights.