The Last Word with Lawrence O'Donnell 09/19/17

Lawrence: Why Trump's UN speech worst, most dangerous in history

Donald Trump says the U.S. could "totally destroy" North Korea. Lawrence O'Donnell revisits a speech by Amb. Adlai Stevenson in 1962 during the Cuban Missile Crisis and argues Trump's speech is the worst ever delivered by the United States at the United Nations. ... more Duration: {{video.duration.momentjs}}