. >>> next, on american history tv, former reagan administration chief of staff, kenneth duberstein reflects ronald reagan speech at the berlin wall 25 years ago when he called on soviet leader gorbachev to tear down this wall. mr. duberstein who was in berlin with president reagan recalls the events leading up to the speech and its impact on the end of the cold war. he's interviewed by james duff, chief executive officer of the nuseum. this program is 40 minutes. >>> let's talk about the days leading up to the great speech, ken, and i've had the good fortune of working with senator baker over the years and he's fond of telling the story that he wanted the line out and drawn through it in a couple of drafts and almost didn't make it in the speech and some of the top advisors were advising against it. set the backdrop for this speech and that line in particular? >> well, howard wasn't the only one who had opposition. when you circulate a presidential speech it goes through something called the interagency clearance process. the state department objected to that one paragraph in the speech. so