The Last Word with Lawrence O'Donnell 05/16/16

Donald Trump campaign hires veteran pollster

MSNBC’s Lawrence O’Donnell discusses the breaking news that Donald Trump hired veteran pollster Tony Fabrizio, reports that some Republicans hope to derail Trump with a third party candidate, plus overall GOP unity, with Howard Dean, Robert Costa, & Ben Ginsburg. ... more Duration: {{video.duration.momentjs}}