with one of that school's most honored graduates, the historian and pulitzer prize-winning writer john meacham of what we said. >> we're fortunate, indeed, to have two experts in the art of conversation. i suspect before very long, we won't be quite sure who is interviewing whom. ( laughter ) >> so 1991, can which is a critical year, the soviet union expends your show begins. >> that's exactly right. >> maybe not in that order. but in these 25 years, we've gone from a republican president, george h.w. bush, the most civil of men, who could not talk about himself; to republican nominee who talks about little else. >> rose: that's right. you tell me what do you think has happened between bush and trump? >> this is the first time where the plane has been hijacked with the help of the passengers. >> rose: right. >> right? so this is-- this is someone who now has a-- one of the two major parties in the country since, you know, founded in 1856, that, you know, he now can fly that through the general election. you've interviewed how many presidents? back to -- >> nixon. i was trying to probe into why