mueller's ten-year term is due to expire in september. let's bring in our senior correspondent ed henry. why did the president ask for next citizening? >> reporter: this ties right back to what barbara was reporting become the aftermath of the killing of osama bin laden, all the intelligence coming in showing the threat from al qaeda oh terror groups is still out there let's not forget, bob mueller is pretty remarkable. he was sworn in office exactly one week before 9/11. so for almost ten years now, he has been at the forefront of trying to keep america safe from all these terror threats. so, what the president is saying publicly is this was all about continuity and making sure that he had some stability, somebody like bob mueller, these impeccable security credentials staying in place. what the president is not saying publicly but know privately from our reporting is he was having a hard time finding someone both with the credentials to replace bob mueller but also someone willing to take on a ten-year commitment t is a ten-year term as fbi director, back-breaking responsibilities now, overseeing