Gellman broke important stories about the use of and misuse of intelligence about Iraqi weapons of mass destruction before and after the war in Iraq, including an account of the previously undisclosed White House Iraq Group. In Iraq, traveling with weapons hunters, he showed vividly how the search for WMD was failing, even as the Bush administration asserted otherwise. When Gellman reported that U.S. and allied teams had exhausted their leads on a "reconstituted" Iraqi nuclear weapons program, the CIA issued a strong rebuttal. In testimony before the U.S. Senate, less than 3 months later, Kay acknowledged that The Post's account had been correct. By January 2004, Gellman used independent interviews on the ground with Iraqi scientists and engineers, U.S. and United Nations officials to tell a comprehensive story about how the prewar allegations fell apart. During the presidential election campaign of 2004, Gellman and partner Dafna Linzer wrote a series on the Bush administration's national security record, offering behind-the-scenes narratives of the war with al Qaeda and of Bush's efforts to stop the spread of nuclear weapons.