aboard air force one u.s. president donald trump say thursday would visit japan south korea china november trip add would possibly include vietnam asia-pacific economic cooperation apec conference trump focus work china try curb north korea nuclear program note invite u.s-asean summit philippines definitive attendance probably go asia group november japan south korea possibly vietnam conference trump say ask asean summit philippines trump acknowledge invite say go see u.s. vice president mike pence announce april visit jakarta trump would attend summit philippines vietnam trump say visit japan south korea china november