Today the FBI announced that it is investigating the San Bernardino massacre as an act of terrorism. Law enforcement agents said the suspects, Syed Rizwan Farook, and his wife, Tashfeen Malik, had been in telephonic contact with other possible terror suspects in the United States.
Thuy Vu interviews Rep. Eric Swalwell, a member of the House Permanent Select Committee on Intelligence, about the influence of ISIS.
Law enforcement officials say the weapons used in the San Bernardino massacre were purchased legally.
The incident was the worst mass shooting in the United States this year. Fourteen people were killed, and another 21 were injured. Most of the victims worked for San Bernardino County.
The shootings have amplified calls for tighter restrictions on gun purchases, but there is resistance by some lawmakers to change existing laws. Stanford law professor John Donohue joins Thuy Vu to discuss gun policies.