Mattis first ever secretary of defense to resign in protest04:26
Michael Beschloss, NBC News presidential historian, talks with Rachel Maddow about the resignation of Defense Secretary Mattis in the context of U.S. history and past presidents' disagreements with defense secretaries.
Buzzfeed stands by Cohen story in face of Mueller objections15:52
Cohen charge of lying to Congress could set up more from Mueller13:27
Mueller filing offers insight into core of Buzzfeed Cohen report07:12
Farrow highlights contention in Buzzfeed Cohen report01:53
Isikoff: 'Red flags' marred Buzzfeed report on Cohen lies05:19
Be forewarned!: Trump preps return of Infrastructure Week02:17