PoliticsNation with Al Sharpton 05/13/15

Why was Amtrak 188 traveling over 100 mph?

Rev. Sharpton talks to MSNBC's Ayman Mohyeldin and Joy Reid for the latest from the derailment of Amtrak Train 188. Then, two former NTSB members, Kitty Higgins and John Goglia join Sharpton to weigh in on what’s next in the investigation. ... more Duration: {{video.duration.momentjs}}