washington u.s. secretary state rex tillerson travel philippines thailand malaysia aug. aug. state department say tuesday tillerson participate meet diplomats association southeast asian nations manila discuss denuclearization korean peninsula maritime security counterterrorism state department say thailand tillerson pay respect late king bhumibol adulyadej die 2016 discuss u.s.-thai relationship officials malaysia discuss bilateral relations officials secretary tillerson travel reaffirm administration commitment broaden enhance u.s. economic security interest asia-pacific region state department say tillerson travel philippines thailand malaysia state department