For more than 30 years, National Security Law has helped create and shape an entire new field of law. It has been adopted for classroom use at most American law schools, all of the military academies, and many non-law graduate programs. The Eighth Edition of this leading casebook provides an up-to-date, user-friendly survey of this extremely dynamic field. Relying heavily on original materials and provocative notes and questions, this book encourages students to play the roles of national security professionals, politicians, judges, and ordinary citizens. And, by showing the development of doctrine in historical context, it urges them to see their responsibility as lawyers to help keep this country safe and free. Like earlier editions, the new book deals with basic separation-of-powers principles, the interaction of U.S. and international law, the use of military force, intelligence, detention, criminal prosecution, homeland security, and national security information — more than enough to provide teachers with a rich menu of readings for classes. The Eighth Edition also addresses dramatic new security threats from without and within. New to the Eighth Edition: The COVID pandemic and its national security implications; Efforts to subvert the results of the 2020 presidential election, culminating in the January 6, 2021 attack on the U.S. Capitol, including the criminal liability of participants, and the possible criminal liability, immunity, and disqualification of former President Trump; Russia’s war of aggression in Ukraine; Espionage Act prosecution of former President Trump in the Mar-a-Lago documents case; The October 7, 2023 attacks on Israel by Hamas fighters based in the Gaza Strip; Climate change and its growing threat to world security.