As the Justice Department continues its criminal probe into the alleged White House naming of an undercover CIA agent to a half dozen reporters, Jim Lehrer and four historians review past cases of alleged presidential leaks to the media.

NPR correspondent Anne Garrels shares her unique experiences as one of the few non-embedded journalists who stayed in Baghdad during the Iraq war, and other stories from her recently published memoir, Naked in Baghdad.

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.

The Justice Department announced that it would launch an investigation into who disclosed the identity of a covert CIA agent, a leak the Washington Post reported occurred when unidentified White House officials called at least six journalists with the information.