Undercover CIA agent Valerie Plame was a specialist in WMD, including cases involving Iraq and Iran. She managed an undisclosed number of spies, and was at times in serious danger in her work. She worked for the CIA from 1985 to 2005.
After her husband, Ambassador Joe Wilson, wrote an op-ed "What I Didn't Find in Africa," published in the New York Times on July 6, 2003. The piece stated that the case for Iraq buying yellowcake uranium from Niger was bogus. The next week, Plame's undercover identity was disclosed to several journalists. Robert Novak published the information, blowing her CIA cover and exposing not only her but her network to possible danger. Disclosing the identity of a CIA undercover agent is a felony. Richard Armitage of the State Department admitted to being the first to tell what he thought at the time was common knowledge.
Plame and Wilson allege that the outing was a deliberate plot by Dick Cheney, Karl Rove and others in the White House. The White House refused to cooperate fully in the grand jury investigation, which thus remained inconclusive, but resulted in the indictment and trial of Vice President Dick Cheney's Chief of Staff Scooter Libby. He was convicted on four charges of lying and obstruction of justice in this case, presumably to protect Cheney. President Bush then commuted Libby's jail sentence. If that was a cover-up, it is itself an impeachable offense.
Plame and Wilson's civil suit against Cheney and Rove was dismissed in Federal court, and is on appeal.