the world. >> a lot of people that i respect rated him as their absolute number one choice. so i think we have a very good chemistry together and i think we're going to have a great relationship. he has a very talented man. >> o'brien arrived at at the sp department master shortly after mike pompeo did. he worked to help free american pastor andrew brunson from turkey and danny birch from yemen. president trump says o'brien called him, the president, the greatest hostage negotiator and claimed the u.s. in his administration is 38-0, freeing american hostages. o'brien says he is to get to work. >> we got a number of challenges, but there's a great team in place and i look forward to working with them and working with the president to keep america safe and continue to rebuild our military and really get us back to -- speak of the president also dispatched him to sweden to help secure wrapper a$ap rocky.