In response to the September 11th terrorist attacks, Congress authorized "war" against al Qaeda in the statute known as the 2001 AUMF (Authorization for the Use of Military Force). Meant to be a temporary grant of powers to allow the President to retaliate against the perpetrators of the attack, two administrations have used the 2001 AUMF to justify controversial policies such as the indefinite detention of terrorist suspects at the Guantanamo Bay prison facility, domestic surveillance without a warrant by the National Security Agency, and the lethal targeting of terrorist suspects using drone strikes in countries with which the United States is not at war. Shoon Murray explores the debate that has emerged about whether it is time to repeal the 2001 AUMF. She documents how the Bush and Obama administrations have used this "war" authority and warns against the sources of inertia—organizational interests, psychological biases, and political incentives—that could make it permanent.