Houthi rebels launch new attacks on Saudi-backed troops

Iranian-backed Houthi rebels have launched new attacks on Saudi-backed troops in Yemen. The attacks come as Turkey, Pakistan and Saudi Arabia sign a mutual defense deal. CBS News national security contributor Samantha Vinograd joins with analysis. Iranian-backed Houthi rebels have launched new attacks on Saudi-backed troops in Yemen. The attacks come as Turkey, Pakistan and Saudi Arabia sign a mutual defense deal. CBS News national security contributor Samantha Vinograd joins with analysis.