have been no nuclear concessions by north korea? that said, we're learning those negotiations may resume again. >> right. there was a u.s. official in the dmz actually delivering photographs, apparently, of president trump's recent meeting with kim jong-un there. a north korean official apparently made it clear to them that there might be the possibility of working-level conversations. but the question will be to what end, to what goal? the administration's official policy is complete, verifiable, irreversible denuclearization. right now there's no indication that kim jong-un is on the road to any of that. so if they sit down and talk, what are they going to talk about? it remains to be seen. a number of u.s. officials hoping at least the talks can resume. >> that phrase, complete, verifiable, irreversible, has not been uttered by the president or senior administration officials for some time. barbara starr, thank you very much. shocking video out of cnn