Weekends with Alex Witt 09/20/14

Manhunt for police shooter continues in PA

MSNBC Analyst and retired ATF Special Agent-in-Charge Jim Cavanaugh discusses with Alex Witt the latest developments in the search for the suspect behind the fatal ambush of a state trooper, as well as new clues in the case of a missing University of Virg ... more Duration: {{video.duration.momentjs}}