In the July 1, 2006, Vanity Fair article, Craig Unger states: “On March 14, Senator Jay Rockefeller IV, the ranking Democrat on the Senate Intelligence Committee, wrote a letter to F.B.I. chief Robert Mueller asking for an investigation because “the fabrication of these [Yellowcake] documents may be part of a larger deception campaign aimed at manipulating public opinion and foreign policy regarding Iraq.” But Senator Pat Roberts, of Kansas, the Republican chair of the committee, declined to co-sign the letter.”

 – Craig Unger, Craig Unger, “The war they wanted, the lies they needed,” Vanity Fair, July 1, 2006