The Last Word with Lawrence O'Donnell 09/17/15

Jeffrey Sonnenfeld talks Trump and Fiorina

Jeffrey Sonnenfeld, a Yale School of Management professor, was mentioned by Donald Trump in his attacks on Carly Fiorina at the second GOP presidential debate. Fiorina calls Sonnenfeld a 'Clintonite.' What's really true? Jeffrey Sonnenfeld joins Lawrence O'Donnell. ... more Duration: {{video.duration.momentjs}}