seoul plan first contact north korea unite state president donald trump take office cancel u.s. state department deny visa top envoy pyongyang wall street journal report saturday talk senior north korean foreign ministry envoy choe son hui former u.s. officials schedule take place march new york call choe deny visa journal say clear lead state department deny visa north korea test-firing ballistic missile feb. 12 murder north korean leader kim jong un half brother malaysia may play role report say south korean u.s. officials say believe north korean agents assassinate kim jong nam estrange half brother kim jong un feb. 13. u.s. state department official deny so-called track two discussions schedule u.s government plan engage track talk new york official say decline comment individual visa case south korean foreign ministry official decline comment report cancel meet new york say report plan involve u.s. south korean government meet new york would first time senior north korean envoy would visit unite state since 2011 first contact u.s. north korean representatives since trump take office choe director general north american affairs north foreign ministry previously meet former u.s. officials academics last time november geneva informal discussions trump say reuters interview thursday concern north korea ballistic missile test dangerous situation trump rule meet kim point future certain circumstances suggest might late first plan north korea-u.s. contact trump administration cancel wsj