the back ground. it's become significant. but also it probably visually will be used for a long time, if this relationship keeps improving. >> optics, you say, would be historic for a u.s. president to be there at the dmz to meet with the north korean leader. and if invited into north korea, to step across the border, again, could be interesting, historic. the optics certainly powerful, as you point out. but the greater question is what's the value? where relations stand now, you get a sense that there is concrete evidence that, you know, the goals that the united states wants to see met there in north korea, that those goals are being met. >> not right now. i think -- you know, we're hoping. one thing to give credit where it's due. i mean president trump has done something that no other american