security advisors and cabinet officials over potential peace talks with the taliban a resulting deal could lead to final exit of our troops in the country and end to america's longest running war. this morning republican senator lindsey graham talked about on "sunday morning futures" leaving that could resume repeated attacks on the homeland. >> we can't leave afghanistan without counterterrorism force or intel capability to protect us a against a 9/11 because al qaeda and is isis is live in afghanistan. reporter: isis claiming responsibility for that attack. a few hours ago the group posting a propaganda photo of the man they claim was perpetrator. terrorism experts say this move has become a signature for the terrorist group who use aftermath of attacks to spread