expressed concern that there is not the preparation necessary to have a clear sense of what pyongyang is willing to offer by way of concessions, what concessions is pyongyang expecting from the united states. no indication thus far kim is serious about getting rids of his nuclear program. if that was laid out in the letter, that is not achievable in this summit. it could be a high profile photo opportunity rather than a peace treaty. >> oneself they, john kirby, have the high profile photo opp, is there pressure on to get something done on both sides in such a way that actually could imperil discussions? >> probably. i think it's a good thing. again, it's being driven by the leaders, which is good, pressurizing their own systems, different as they may be, in unique ways. remains to be seen whether the energy that's going into the summit continues past it, but the fact that both leaders want