new york president donald trump speak forcefully threat pose north korea first address unite nations tuesday knock see enable pyongyang speak extremely tough term north korean menace threat pose security security nations room white house official tell reporters call preview trump remark u.n. general assembly talk well enablement north korean regime mean official say official speak condition anonymity elaborate mention enablement likely reference china frustrate trump fail rein north korean leader kim jong un north korea nuclear test missile launch stir global tensions trump speak chinese president xi jinping early monday commit keep pressure north korea enforce u.n. resolutions white house say tuesday trump also expect go hard iran speech official say would espouse importance state sovereignty appeal nation use sovereignty basis mutual cooperation idea rather appeal top-down model global bureaucracy model nation-state say border control trade international agreements unfavorable unite state represent threats u.s. sovereignty official say theme consistent trump america first philosophy help win election last year nl2n1lf26c trump critical international organizations include nato unite nations monday criticize 193-nation body bloat bureaucracy mismanagement say reform would help emerge strong effective trump speak 'tough term north korea first u.n. speech