The Pentagon has issued a fact sheet which attempts to rebut the charges several retired generals have made against Rumsfeld about his lack of management ability and general screwups at DOD.
The last paragraph of the article about this fact sheet reads as follows:

“If this were to happen,” Mr. Cornyn said, “it would encourage demands for other members of the cabinet or other people close to the president to resign.”

“Close to the president?” Why stop there?