The indictment against Cheney's Chief of Staff, I. Lewis "Scooter" Libby, clearly states that Cheney and Libby discussed Plame's undercover CIA status and the fact that her husband, former Ambassador Joseph Wilson, traveled to Niger to investigate claims that Iraq tried to acquire yellowcake uranium from the African country in early June of 2003. Yet the following month, Cheney and then-White House press secretary Ari Fleischer asserted that the vice president was unaware of Wilson's Niger trip, who the ambassador even was, and the classified report Wilson wrote about the Niger findings prior to his July 6, 2003 op-ed in the New York Times.

http://www.truthout.org/docs_2005/110705Q.shtml