Sandy Berger, the Clinton administrations national security advisor, is under criminal investigation for removing classified documents on terrorism from the National Archives. Berger spent three days reviewing government documents last summer, while preparing to testify before the 9/11 commission. The FBI searched Bergers home and office after archive employees reported seeing Berger put papers into his pockets. Law enforcement sources told CNN that Berger stuffed some of the material into his socks. Berger said this week that he inadvertently took a few documents, including his own handwritten notes, and he apologized for his sloppiness. Former White House spokesman Joe Lockhart said Berger categorically denies he ever took documents and stuffed them into his socks.