If Isikoff was such a disreputable sleazemonger, why would Toobin want to write a book with him?
Toobin wrote a book about Iskikoff even with his bad reputation.
Even when Forrest Sawyer is sitting in, it's still World News Tonight With Peter Jennings . Just because Johnny goes on vacation, The Tonight Show Starring Johnny Carson doesn't suddenly become The Tonight Show With Jay Leno . The task of a guest host is delicate.