Author and publisher Peter Osnos talks about "LBJ and McNamara," a book-length Substack serial and soon to be book about President Johnson and Secretary of Defense Robert McNamara's handling of the Vietnam War. Mr. Osnos, Saigon correspondent for the Washington Post during the war, also talks about publishing Robert McNamara's memoir "In Retrospect" and the meetings he had with McNamara in preparation for that book, which Mr. Osnos recorded.

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