According to Topdog08.com, "the word I got from him (checking Shaffer's story) was that contrary to popular knowledge, Rummy didn't pull the plug on the witnesses, it came from "Cobweb".
Cobweb is security for
Vice President's office "Cheney" or assistant, per Secret Service.
Site for all code names:
http://www.2600.com/secret/more/codes.html