Jonathan Mahler describes his new book, *The Challenge: Hamdan v. Rumsfeld and the Fight Over Presidential Power*. It is the authorized account of a landmark court case on presidential power and the rule of law in the history of the Supreme Court. After confessing to being Osama bin Laden's driver, Salim Hamdan was transferred to Guantánamo Bay and he was designated by President Bush for trial before a special military tribunal. Mahler explores the stories of Hamdan's attorney Lt. Commander Charles Swift and his assistant Neal Katyal, a young constitutional law professor at Georgetown University. Mahler is a writer for *The New York Times Magazine* and the author of *Ladies and Gentlemen, the Bronx is Burning*.
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