i m erin burnett. out front on a friday night, the end of the war in iraq. all american troops will be home by the end of the year. that s 39,000 men and women. there was talk that 5,000 troops might stay next year, but, no. we ve got jessica yellin at the white house and chris lawrence at the pentagon. i wanted to start with you. this came down to whether our troops would be protected proprosecution in iraq in part, didn t it. reporter: that s right. the white house, this administration and the iraqi government were trying to work out a deal to get american troops immunity from iraqi laws so that some could stay behind as trainers and advisers. the iraqi government did not agree to that and you heard the president announce that all u.s. troops would be coming home. some critics are raising security concerns with all u.s. troops leaving iraq by year s end, and the president emphasized that he has kept a campaign promise. this was a man who ran vowing end to the war in ira