The Last Word with Lawrence O'Donnell 05/04/16

Donald Trump: the nomination of a birther

Donald Trump is now the presumptive GOP nominee. His is a campaign that started on a lie seven years ago: a challenge of Pres. Obama’s birth certificate. Lawrence O'Donnell looks back at the evolution of the Trump campaign from birther to presumptive nominee. ... more Duration: {{video.duration.momentjs}}