As a presidential candidate, Barack Obama criticized the George W. Bush administration for its unrestrained actions in matters of national security. In secret Justice Department memos, President Bush's officials had claimed for the executive branch total authority to use military force in response to threats of terrorism. They set aside laws made by Congress, even criminal laws prohibiting torture and warrantless surveillance. Candidate Obama promised to restore the rule of law and make a clean break with the Bush approach. President Obama has not done so. Why? In a thorough comparison of the Bush and Obama administrations' national security policies, Chris Edelson demonstrates that President Obama and his officials have used softer rhetoric and toned-down legal arguments, but in key areas-military action, surveillance, and state secrets-they have simply found new ways to assert power without meaningful constitutional or statutory constraints. Edelson contends that this legacy of the two immediately post-9/11 presidencies raises crucial questions for future presidents, Congress, the courts, and American citizens. Where is the political will to restore a balance of powers among branches of government and adherence to the rule of law? What are the limits of authority regarding presidential national security power? Have national security concerns created a permanent shift to unconstrained presidential power?

Can a U.S. president decide to hold suspected terrorists indefinitely without charges or secretly monitor telephone conversations and e-mails without a warrant in the interest of national security? Was the George W. Bush administration justified in authorising waterboarding? Was President Obama justified in ordering the killing, without trial or hearing, of a U.S. citizen suspected of terrorist activity? Defining the scope and limits of emergency presidential power might seem easy-just turn to Article II of the Constitution. But as Chris Edelson shows, the reality is complicated. In times of crisis, presidents have frequently staked out claims to broad national security power. Ultimately it is up to the Congress, the courts, and the people to decide whether presidents are acting appropriately or have gone too far. Drawing on excerpts from the U.S. Constitution, Supreme Court opinions, Department of Justice memos, and other primary documents, Edelson weighs the various arguments that presidents have used to justify the expansive use of executive power in times of crisis. Emergency Presidential Power uses the historical record to evaluate and analyse presidential actions before and after the terrorist attacks of September 11, 2001. The choices of the twenty-first century, Edelson concludes, have pushed the boundaries of emergency presidential power in ways that may provide dangerous precedents for current and future commanders-in-chief.