. >> first of all, before i answer i forgot to mention david coleman. i don't know. if he's here or not. is he here? >> thank you, david and over in the far corner with the shiny light on top of his shiny head is ken who is one of the most brilliant individuals who works at the miller center and if you want to talk about someone who wants to know tapes and the 9/11 you are of the presidency he's one of the primary people to speak to despite being a really nice guy. the answer to your question is that ambrose normally gets a lot of stuff wrong. his interviews that he has with eisenhowerer, many of them didn't happen. he was outed, if you read something in "the new yorker" called challenging ike in april 2010, i believe, he made up many of the meetings. they never occurred and the answer from your question in the research is eisenhower felt that no one since martin van buren had moved from the vice presidency to be elected president of the united states. eisenhower had an incredible sense of history and was very protective of nixon in many ways and he felt this nixon ne

our guest is david coleman. caller: my question is this.others, who decided when to tape? was this a presidential decision or was this the person running the recording device, or was there any pattern that you can decipher? guest: that is an excellent question, and it varies for each president. in the case of president kennedy, he decided to control the taping system. this was something he decided on his own. he asked the secret service to install the system. he did not tell all of his aides. his secretary, evelyn lincoln did not know about it. he considered these his records and in the cabinet room, he would sit at the middle of a long table and there would be a button that just look like a buzzer. in the oval office, he had other concealed buttons. it was kennedy who pushed the button on when to record and when to stop. his secretary could also decide if she thought kennedy should turn the machine off or something, but it was kennedy who decided when to record and when not to record. what in the end up with is a fairly sporadic record. yo

. >> david coleman headley was a specialist in constructing a blueprint of the killing zone. >> a dream come true from the perspective of a terrorist group. >> a sociopath, evil... >> a u.s. double agent... >> did they ask him about his work for the u.s. government? >> we were told by the u.s. that is not to be asked. >> "a perfect terrorist," a frontline/propublica investigation. >> frontline continues online. learn more about the opium brides problem and the politics of poppy eradication. watch frontline's other undercover reports inside afghanistan, and hear from a prominent former u.s. official about why he believes drone strikes in pakistan may be counterproductive. >> in a sense, we have helped to bring about the situation that we most fear. >> follofrontlion facebook and twitter, or join the discussion at pbs.org/frontline. >> frontline is made possible by contributions to your pbs station from viewers like you. thank you. and by the corporation for public broadcasting. major funding is provided by the john d. and catherine t. macarthur foundation. committed to building a more ju