Bush quizzed on CIA leak

"The leaking of classified information is a very serious matter," said White House press secretary Scott McClellan, adding that Bush repeatedly has said he wants his administration to cooperate with the investigation.

Bush was interviewed for 70 minutes on Thursday by US Attorney Patrick J. Fitzgerald, the head of the Justice Department investigation, and by members of his team. McClellan said the only other person in the room was Jim Sharp, a private trial lawyer and former federal prosecutor hired by Bush.

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Investigators want to know who leaked the name of Valerie Plame, an undercover CIA operative, to syndicated columnist Robert Novak last July. Disclosure of an undercover officer's identity can be a federal crime.