washington president donald trump pick former u.n. spokesman richard grenell u.s. ambassador germany white house official speak condition anonymity say thursday grenell serve u.s. spokesman unite nations 2001 2008 administration republican president george w. bush currently grenell contributor fox news nomination envoy nato ally germany must confirm u.s. senate trump scold germany reach nato target defense spend complain trade surplus unite state grenell immediately respond request comment trump pick former u.n. spokesman grenell ambassador germany