Transcript for Kim Jong Un, Trump shake hands, make history

This. Is an ABC news special report trump and the historic summit bell reporting from the sale. George Stephanopoulos. Good evening you saw it right there that handshake that has never happened before an American president in North Korean dictator shaking hands here in Singapore. Just about an hour ago. The president and Kim Jong and then went behind closed doors after that greeting before the cameras. Both saying they expect a very good meeting. Saw a slight smile on the face of content on the president. Relatively serious there before the cameras. Both showing a stern face of the world. And then just moments ago after a meeting for about forty minutes but they're translators. The president contingent on. Walking across that colony. For a broader meeting where they're going to be where their top staff that is under way right now. The president joined by his secretary of state Mike Pompeo is now asking advisor John Bolton chief of staff John Kelly delegation met with Kim Jung on. As well our chief White House correspondent John Paul covers the White House every day there with the White House filing center. And John interestingly John Bolton made it into that meeting he has been the hardest of hardliners. On North Korea almost tank the meeting. Last month when he talked about the Libya model. North Korea doing away with all of its nuclear weapons and we don't know what happened a mall market up. Yet here cut Gaddafi of course give up the nuclear weapons and that was murdered on the streets. Of Tripoli up put Fulton is somebody who is the hardest stuff hardliner George you remember shortly before he became national security advisor. He joked that the way to tell the north Koreans are lying is to look at whether they're lips are moving. The north Koreans to test John Bolton but there's a little bit of a good cop bad cop going on here. Obviously Mike Pompeo seems to have. Established quite warm relations with the Kim Jong Hoon he's met with him on now multiple times. And the big question coming out of this is will there be. Any agreement whatsoever. George I would say that the single biggest way to measure the success of this first meeting if it is the first meeting is whether or not. They are saying that they will meet again because clearly you're not gonna get a detailed agreement out of this short encounter here and think before. That's a question Martha Raddatz can they cobble together some kind of joint statement. That sets the ground work for future negotiations I. I'm sure that's what they're trying to do but let's remember what the goal eventually is complete. Verifiable. Irreversible. Denuclearization. Mike Pompeo secretary of state said that. Very clearly here yesterday they say it again and again. And David Muir that was the question can join lining or three times in that walk across the colony. Yet you've heard reporters asking this repeatedly he'll get it no question again before this day is over king Jong when asked will he get rid of its nuclear weapons. But Georgia as you know ultimately that's what got him to the table across from the president of the United States in the first place he's lost more ballistic missiles and his father and grandfather combined. They tested that hydrogen bomb last September larger than the bomb dropped on Hiroshima. And you heard secretary of state Mike Pompeo pressed on this repeatedly in the last 24 hours will there be any kind of agreement. That allows for economic relief before all of that is destroyed and he was very clear and perhaps it's posturing going into the summit. But he was clear in the last 24 hours saying no economic relief. Until we see all of that. Destroyed the sequencing is so important and that's what they're negotiating right now we're gonna say would this. All night long return at a regular programming fraud you watching the network of continuing with our coverage John. The digital ABC news online. This has been a special group. From the ABC.

This transcript has been automatically generated and may not be 100% accurate.