tonight, more from london with annabel roberts. >> hello. good evening. and welcome. hello.ood evening. and welcome. >> reporter: the legendary journalist interviewed seven u.s. presidents and eight british prime ministers, but it was david frost's exchanges with nixon that stand out, his persistent questioning finally drawing out an apology for watergate. >> i let down my friends. i let down the country. >> reporter: to this day, a dramatic moment of television history. >> the frost/nixon interviews gave america the trial that richard nixon never had. david was the easiest person to work for that i ever had. he was generous. he was kind. he distributed compliments. >> reporter: it wasn't just controversial interviews. frost had a light touch, too, with a reputation in britain for comedy and satire. >> listen, david, when i meet this man, if you think the world was surprised when nixon resigned, wait till i whip foreman's behind. >> reporter: his relaxed style seemed to disarm his interviewees. >> did you ever believe that stuff about having the weapons of mass destruction t