Weekends with Alex Witt 11/21/15

NYPD head: ‘We won’t be intimidated’

The attacks in Paris and Mali are raising new concerns in the U.S. about the possibility of an attack. A video released by ISIS this week, appeared to threaten New York City. The city’s police commissioner quickly spoke to diminish those fears. Former FBI special agent Don Borelli shares his thoughts on these apparent threats. ... more Duration: {{video.duration.momentjs}}