Not sure if this has been posted, but it's definitely of interest.
http://www.afterdowningstreet.org/?q=node/3857 <snip> during the meeting, powell recounted to the senator that he had traveled on air force one with bush and cheney, and brought to their attention a classified memorandum about the issue of whether there was indeed a transaction inolving niger and yellow cake uranium. the document included ambassador joe wilson's involvement and identified his wife, valerie plame, as a covert agent. the memorandum further stated that this information was secret. powell told mccain that he showed that memo only to two people--president and vice president. according to powell, cheney fixated on the wilson/plame connection, and plame's status.
powell testified about this exchange in great length to the grand jury investigating the plame case. according to sources close to the case, powell appeared convinced that the vice president played a focal role in disclosing plame's undercover status.
in his conversation with mccain, powell felt that--at a minimum--there would be a serious shakeup at national security council as a consequence. in particular, vice president cheney would no longer hold a pivotal role in us national security affairs. powell apparently did not discuss the potential of a cheney resignation.