Andrew Johnson, Richard Nixon and Bill Clinton each served as President of the United States. And each faced impeachment while in office. Host Krys Boyd hosts a panel discussion about the use of impeachment with the authors of “Impeachment: An American History” (Modern Library). Joining us are Jeffrey Engel, founding director of the Center for Presidential History at Southern Methodist University; Peter Baker, chief White House correspondent for the New York Times; Timothy J. Naftali, former director of the Richard Nixon Presidential Library and Museum; and historian Jon Meacham.