The book begins by reviewing the law often associated with threats posed by foreign enemies such as espionage, terrorism and treason. National security cases that arise in the domestic context, such as disclosure of intelligence information, export of sensitive technology and domestic.terrorism, are then examined. A following section reviews sometimes controversial government actions utilized to gather information and detain individuals such as pen registers, National Security Letters, Foreign Intelligence Surveillance Act and Title III interceptions, extradition and rendition as well as the screening of intelligence information through the Classified Information Procedures Act. In an important Chapter on the government s power to act in a crisis, Professor Sievert proceeds from the important civil war case of Ex Pate Milligan outlining martial law to a review of the last decade s critical cases on habeas corpus, military commissions and military assistance. In the final section the casebook examines the War Power with historical cases on Executive versus Congressional authority, efforts to stop the Vietnam and Iraq wars and attacks on Yugolslavia and Libya, a Gulf War Chronology and summary of the effects of the War Powers Act and a review of the Authorizations for Use of Military Force 2001, 2002 as well as the government s recent legal justifications for drone attacks.