The Last Word with Lawrence O'Donnell 03/12/15

McCain, other Republicans now regret letter?

After a fierce blowback against the letter to Iran signed by 47 Republican senators, John McCain and even Rand Paul appear to be having second thoughts. Lawrence talks to fmr. Gov. Howard Dean, msnbc's Beth Fouhy, and Steve Clemons of The Atlantic. ... more Duration: {{video.duration.momentjs}}