seoul u.s. president donald trump may travel heavily fortify demilitarize zone dmz separate north south korea visit south korea next month south yonhap news agency say tuesday cite defense source white house send advance team working-level officials late september check candidate sit trump special activity south korea source quote say trump expect send significant message north korea either verbally kinetically first trip peninsula u.s. commander-in-chief source say truce village panmunjom observation post inside dmz among locations trump consider visit source say yonhap elaborate white house comment trump north korean leader kim jong un engage increasingly bellicose exchange rhetoric trump suggest military option way halt north missile nuclear program trip dmz follow footsteps predecessor barack obama vice president mike pence would bring trump within yards north korean soldier stand eyeball eyeball south korean enemies likely regard north highly provocative recent weeks north korea launch two missiles japan conduct sixth nuclear test defiance u.n. security council resolutions may fast advance toward well publicize goal develop nuclear-tipped missile capable hit u.s. mainland trump repeatedly make clear distaste dialogue north korea last week dismiss idea talk waste time day secretary state rex tillerson say washington maintain open line communication kim jong un government country unsuccessfully deal north korea 25 years give billions dollars get nothing policy work u.s. president say twitter post monday reclusive north korea rich democratic south technically still war 1950-53 conflict end truce peace treaty north regularly threaten destroy south main ally unite state trump schedule visit japan south korea china vietnam philippines start nov. 3. trump may visit dmz north south korea yonhap