and israel. with tensions rising throughout the region, is iran now the greatest threat? >> our policy is to prevent iran from acquiring a nuclear weapon. >> will syria's civil war spill over? >> assad's regime must understand they will be held accountable for the use of chemical weapons or their transfer to terrorists. >> i'll ask the president's one-time middle east peacemaker, george mitchell, is now the time to kiss and make up? this is "piers morgan live." you know i'm passionate about the issue of guns in america. you've heard a lot of heated debate on this show on both sides. well, tonight, i'm going to talk to five men who probably know more than most of us about guns and in particular the aftermath of the acrossty of newtown. they're police chiefs in and around newtown. all of them having experience and trauma of that terrible day at sandy hook elementary school. sadly, the toll of guns doesn't end there. colorado's prison chief tom clements was gunned down in the doorway of his home last