The terrorism question looming over San Bernardino

There are many unknowns in the San Bernardino mass shooting, including what motive propelled the suspects to unleash their deadly force at a social services center. So far, several reports have suggested that the FBI is treating it as a terrorist case. Judy Woodruff talks to Michael Leiter, former director of the National Counterterrorism Center, and Seamus Hughes of George Washington University.