"We were all laughing about it," Clinton said about the investigation into Sandy Berger for taking classified terrorism documents from the National Archives. "People who don't know him might find it hard to believe. But ... all of us who've been in his office have always found him buried beneath papers."

"I feel terrible for Sandy. But I just believe his explanation because I know how much he cared about this ... terrorism business," Clinton said, describing his former security advisor as a "workaholic" who has "always been up to his ears in papers."