If 'is' means is and never has been . . . If it means there is none, that was a completely true statement. And it would have been completely true. Starr and his deputies found Clinton incredible in all of his semantic moves and based their 11-count impeachment referral on their conclusion that he was a practiced liar who knew that he was lying. But an utterly ironic argument can be made, according to some legal scholars, that Clinton's long-standing pattern of semantic maneuvering has had the effect of making his claims against perjury more credible.
Perjury requires that a person knowingly and willfully set out to deceive.
Perhaps Clinton has become so habitual in his methods that they are no longer an act of deception. A Biography of Bill Clinton.