washington u.s. president donald trump deputy national security adviser strategy dina powell plan resign early next year continue role middle east diplomacy white house say friday white house spokeswoman sarah sanders say powell key player u.s. diplomatic efforts middle east always plan stay one year trump white house return home new york powell could one several administration officials leave one-year mark trump presidency speculation center secretary state rex tillerson officials say could replace cia director mike pompeo top economic adviser gary cohn may possibly leave also powell replacement likely nadia schadlow national security council aide work powell new u.s. national security strategy expect release next couple weeks senior administration official say powell one trump inner circle key aide national security adviser h.r mcmaster engage diplomacy throughout middle east trump senior adviser son-in-law jar kushner dina do great job administration value member israeli-palestinian peace team continue play key role peace efforts share detail future kushner say statement trump move unite state officially recognize jerusalem capital israel denounce across much arab world team work framework potential israeli-palestinian peace deal aid say could release early next year trump senior aide dina powell resign early next year white house