What is the explanation for this passage in the indictment
(page 8, items #22-23 ...
22. On or about July 12, 2003, LIBBY flew with the Vice President and others to and from Norfolk, Virginia, on Air Force Two. On his return trip, LIBBY discused with other officials aboard the plane what Libby should say in response to certain pending media inquiries, including questions from Time reporter Matthew Cooper.
23. On or about July 12, 2003, in the afternoon, LIBBY spoke by telephone to Cooper, who asked whether LIBBY had heard that Wilson's wife was involved in sending Wilson on the trip to Niger. LIBBY confirmed to Cooper, without elaboration or qualification, that he had heard this information too.
Does this not suggest that Libby discussed and planned in advance with others travelling with the Vice President (including possibly the Vice President himself) how he would respond to Cooper's questions about Wilson and his wife? After discussing the matter with colleagues in the Vice President's office he proceeded to speak with Cooper and confirm that it was indeed his understanding that Wilson's wife was a CIA employee.
So he planned what to do in advance with other members of the Vice President's staff. And what they seem to have agreed is that he would confirm Plame's identity, since that is in fact what he proceeded to do.