Lying is the best defense.
“I’d say, ‘Gee, I just don’t remember what happened back then,’ and they won’t be able to indict me for perjury and that, maybe that’s the principal thing that I’ve learned in four years . . . . I just intend to rely on that failure of memory.”
Source: "The White House Plays Ruff," by Byron York, The American Spectator, June 1997, page 30.