mr. ellsberg became consultant to the white house and defense department on matters concerning the vietnam war. giving him access to classified and top secret documents. he photocopied a 7,000-page study that later became known as the pentagon papers. in 1971 he gave those documents to the "new york times." the richard nixon presidential library conducted this interview as part of a project to document the 37th president's administration. mr. ellsberg talks about his motivations in leaking is pentagon papers as well as his opinions on the vietnam war. this portion is about an hour and 20 minutes. >> right from the beginning and until late in '71 when they came out, so for, what is that, two years, a couple of years, i always thought for the pentagon papers to have any effect, they should be the basis for congressional hearings. precisely because i knew they didn't tell the whole story or an adequate story. i knew what was -- a lot of what was excluded from them. and what you needed was oral testimony, preferably under oath of people who really knew the decision-making at the time and could