One lawyer in his office said that Bellinger was chagrined to learn, indirectly, that Cheney had read the confidential memo and "was concerned" about his advice. Thus Bellinger discovered an unannounced standing order: Documents prepared for the national security adviser, another White House official said, were "routed outside the formal process" to Cheney, too. The reverse did not apply.
I guess if you were the sort of person who would be inclined to read the Post's Cheney expose then you wouldn't need a link from me to find it. Anyway, this paragraph, discussing an incident from late 2001, jumped out.