washington u.s. president donald trump intend nominate michael griffin former administrator national aeronautics space administration nasa undersecretary defense research engineer white house say monday white house say october trump intend tap griffin principal deputy undersecretary defense acquisition technology logistics monday announcement give reason change griffin recently serve chairman chief executive officer schafer corporation provider scientific engineer technical service products national security sector white house say hold top nasa job 2005 2009. trump nominate former nasa chief griffin defense undersecretary