red lines about chemical weapons thereby giving a green light to bashar assad to do anything short of that. shannon: arizona senator john mccain weighing in on the situation in syria and how the u.s. should respond now. some republicans claim that president obama boxed himself in by drawing that red line. i m shannon bream. a brand new hour of america s news headquarters live from washington begins right now with team coverage of the situation in syria. conor pow you wel pow powell ot bureau. now, that there is evidence that the aassad regime has used chemical weapons there is mounting pressure to intervene. today said he was ordered to use chemical weapons in the tunnels and caves used by rebel ares but refused the order and