IE 11 is not supported. For an optimal experience visit our site on another browser.

Jeffrey Sonnenfeld talks Trump and Fiorina

07:53

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.