For U.S. Allies, `Mad Dog' Mattis Is the Last Adult in the Room

Dec.10 -- Since Donald Trump assumed office almost two years ago, U.S. allies in Europe, Asia and beyond have counted on a number of so-called adults in the room to constrain an unpredictable president. With the imminent departure of White House Chief of Staff John Kelly, only Defense Secretary Jim Mattis remains. Bloomberg's Marc Champion reports on "Bloomberg Surveillance."

Advertisement