This course is about the balance of liberty and security in combating threats to the nation and the state. A broad survey course in U.S. national security law, it examines both substantive questions (where to strike the balance?) and institutional questions (who decides where to strike the balance, or who enforces it?) in three major areas: constitutional structure and allocation of national security powers and decision-making among the branches; state restrictions on civil liberties, including privacy rights, in combating national security threats; and issues of secrecy and accountability for covert activities. This is not a course on law and terrorism, though contemporary problems related to terrorism will feature heavily. Some comparative examination of foreign national security law will be used to enhance our study of U.S. law.