David Rubenstein’s new book, “The Highest Calling," offers insights into presidential history

David Rubenstein is well known as the founder of the Carlyle Group, for giving millions of dollars to repair, maintain, and improve D.C. landmarks like the Washington Monument, and most recently, is the new owner of the Baltimore Orioles. But the billionaire philanthropist is also an author. His new book about the American presidency called "The Highest Calling," includes some of the interviews that he conducted with current and former U.S. presidents.