In his audiotaped testimony, Lewis told Patrick Fitzgerald, the special prosecutor in the leaking of Valerie Plame Wilson's identity, that his life as Vice President Dick Cheney's chief of staff was so hectic he could not remember conversations about her with reporters, CNN reported. Libby is charged with obstructing the investigation into the leak.
"I can't possibly recall all the stuff I think is important, let alone other stuff that I don't think is as important," Libby said before the grand jury on March 5, 2004.
Several reporters and present and former White House staffers have given testimony that disputes Libby's story to the grand jury.
Libby's lawyer, Theodore Wells Jr., is considering keeping his client off the witness stand, The New York Times reported. Wells filed a motion asking U.S. District Judge Reggie Walton to clarify whether Libby would need to testify in order to use the defense of faulty memory because of distraction.