The Last Word with Lawrence O'Donnell 10/20/17

Gen. John Kelly's credibility takes a hit

The White House Chief of Staff, Gen. John Kelly, put his credibility on the line for President Donald Trump, and now he is mired in controversy many find grotesque. Christina Greer, Tim O'Brien, and James Peterson join Ari Melber to discuss. ... more Duration: {{video.duration.momentjs}}