Terrorist kills 11 worshipers in Pittsburgh synagogue: What can prevent these attacks?

The murders of 11 worshipers at a Pittsburgh synagogue is the most deadly antisemitic attack in USA history. Nancy Grace visits with Jon Pushinski, a member of Dor Hadash congregation that was meeting in the Tree of Life synagogue when Robert Bowers allegedly launch his shooting rampage. Others on the panel include Brian Levin, director of the Center for the Study of Hate & Extremism, forensics expert Joseph Scott Morgan, psycho analyst Dr. Bethany Marshall, terror expert Bruce Alexander, and reporter Art Harris.