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

Amb. Sherman on Trump UN speech: 'Dangerous' where U.S. is headed

Lawrence O'Donnell talks to Amb. Wendy Sherman, who worked on the Iran Deal and was a special advisor for President Clinton on North Korea, to get her take on Trump's speech and what he could have possibly meant when he threatened to "totally destroy" North Korea. ... more Duration: {{video.duration.momentjs}}