Politics

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A Justice Department investigation into the alleged White House leak of an undercover CIA agent's identity is expanding to include other federal agencies. Experts explain the workings of such an investigation.

David Kay, the lead CIA investigator into weapons of mass destruction in Iraq, briefed House and Senate Intelligence committees today about his interim findings. Jim Lehrer speaks with Kay about his testimony on Capitol Hill.

The Washington Post reported on Sunday that top White House aides leaked the identity of an undercover CIA agent after her husband, former Ambassador Joseph C. Wilson IV, publicly challenged President Bush's prewar intelligence on Iraq. Margaret Warner discusses the…