ground in five hours. is that enough time, do you think? does that show a seriousness on the part of the north koreans' commitment to these summit talks, or are they actually there with the photo-op, the meeting with the president and back to north korea as usual? >> they are there for photo-op, something they will play over and over again and make a big deal out of. again, this is to get things started. you look at every nuclear arms agreement historically. it takes years to negotiate, so it's not something that's done in five hours or a day or two. it's certainly enough time to start a process on a positive note, but not really much more than that. >> all right. jean lee, balbina and greg, thank you very much for joining us this afternoon. >> thank you. still ahead, president trump's aides doubling down on his twitter tirade aimed at prime minister justin trudeau. how the spat with our neighbor