this is cnn breaking news. >> good morning. i'm victor blackwell with christi paul, and we are coming on, for the first time, a sitting united states president has met a north korean leader at the border with south korea and walked across that border. >> and the north korean leader made history by crossing into south korea. we want you to see what led up to the historical handshake between donald trump and kim jong-un.

>> it's good to see you again. i never expected to see you at this place. >> you will be the first u.s. president to cross this line.

>> hey, hey. wait until they move. thank you. >> thank you, mr. president. >> president trump has walked across the demarcation line,

making the first u.s. president to visit our country. >> i believe, looking at this, is an expression of his willingness to eliminate the unfortunate past and open a new future. >> i just want to say, this is my honor. i didn't really expect it. we were in japan for the g20. and i said, i'm over here. stepping across that line was a great honor. a lot of progress has been made. a lot of friendships have been made. this has been a great friendship. i want to thank.

>> we're going to go inside and talk for a little while about different things. a lot of positive things are happening. and i'm glad to be here to see it. tremendous positivity. great things are happening in a lot of places. we met and we liked each other from day one. that was very important.

thank you, everybody. thank you. i'm going to invite him right now to the white house. >> it would not be possible to have this kind of meeting. i want to use this strong relation, to create more good news. >> i want to thank you, chairman. you hear the power of that voice. nobody has heard that voice before. he doesn't do news conferences, in case you hadn't heard.

this is a special moment. like president moon said, this is a historic moment, the fact that we're meeting. and i want to thank chairman kim for something else. when i put at the social media notification, if he didn't show up, the press was going to make me look very bad. you made us both look good. i appreciate it. i think if you go back 2 1/2 years and you look at what was going on, prior to my becoming president, it was a bad situation. a dangerous situation, for south korea, for north korea, for the world. the relationship has been so much to so many people. it was an honor to be with you. it was an honor you asked me to step over the line. i thought you might do that. i wasn't shuure. i was ready to do it. it's been great.

we were saying this could be a historic moment, i guess that's what it is. i enjoy being with you. thank you very much. >> whether you support this or you don't, from the political basis, that was a historic extraordinary moment. president trump moved from that moment, and a 15-minute meeting, to kim jong-un, where he is now. you see hundreds and hundreds of u.s. troops, phones in hand, video going, cameras at the ready, to see the president, as he is on marine one there. >> you see the podium and the teleprompter. the president will be delivering remarks here. this is a forum he does well and enjoys speaking to servicemen

and women at the air base there. before speaking with chairman kim, he spoke with u.s. and south korean troops, as well. and received a gift from those troops. this has been a historic morning for the president. then what? what will be the fruit of those meetings. let's go to our team there in south korea. cnn international correspondents, paula hancocks and will ripley. let's start with you, paula. the imagery, first, is historic. the question is, what will be the fruit of this day? >> that's a really important question, victor. we started the day thinking that there may or may not be a meeting at the dmz.

we heard the u.s. president say, it may be a handshake. what we ended up having was almost an hour of the leaders of north korea and the united states, behind closed doors having bilateral talks. what we have seen, we don't know what they said inside, but what they shared with us, they have agreed to restart talks. we didn't hear denuclearization. what we did hear from kim jong-un, as he was walking out of those meetings, is president trump showing what he took away out of the meeting. the fact that we can meet anytime now. president trump said they would agree to set up separate teams to negotiate again.

they had teams in place after singapore. they had them in place after hanoi, as well. there appears to be a shakeup in north korea, what they're going to be doing and who is in control. what we have seen at the end of the day, from president trump, is that the two sides have agreed to restart these talks. we have to see where that goes from here. does that develop any further? the talks were stalled. they weren't going anywhere. i don't have the answer. what will go on? >> that's been the question after singapore, after hanoi and after this meeting, as well.

reports that he was curious. president trump walked away from the table. they've come back to the table behind closed doors. we see the president here. he's getting ready to step up to the podium. it was interesting because when he did meet with tim jong un, they stepped across that line. they said, a lot of friendship has been made. let's listen to the president now. >> thank you very much. thank you very much. this is great. oh, that sounds good. thank you very much. at ease. we'll have some fun. we're about 2 1/2 hours late.

instead of losing people, you actually gained people. a lot of people here. great military people. it was a little unexpected. look at that media back there. that's a lot of media. we have a lot of media following us. you're doing a great job. the reason i met with kim jong-un. we want to get this solved. it's been going on for a long time. we had a great meeting. it was unexpected. i put out yesterday, maybe i will meet with chairman kim. he saw it. social media. pretty powerful thing, social media. i left and said, this was unexpected. we're going to keep a lot of

thousands of great military people waiting. i said, they'll understand. i'm thrilled to be here this afternoon, with the very heroic men and women of the u.s. air force korea. great place, great country. i have toured it all. i've been doing this for a long time now. it's been days. i left japan. i met with every leader. presidents, prime ministers, dictators, i met them all. our country probably has never had a better economy than we have right now. never had.

we're doing great. you're fighting. you're a great people. you're fighting and fighting hard. just your presence. as president, i have no great honor to serve as commander in chief of the greatest fighting force of the face of the earth. the united states military. thank you very much. as i met with president moon also. he just called me again. he's so happy and thrilled. we met at the dmz. i gave a speech to a group of guys.

now, i'm giving a speech to a big group of people. and a good looking group. we had a productive meeting. i outlined the incredible prosperity that awaits north korea when this whole things gets settled. they've been talking about this for a long time. that's a country with tremendous potential. i have a good relationship with chairman kim. they were giving us a great briefing at the dmz. they said it was so different before we had the meeting, the big summit, in singapore. it was different. it was really hostile. you understand it better than anybody. since our first meeting, we got along. we had a great feeling.

tonight, you'll see it on television. you'll see it wherever you see it. you'll see some nice sights. i stepped in with chairman kim. i stepped into north korea. and they say that's a very historic moment. i think it is a historic moment and a very good moment. he asked me, would you like to do that? he said, it would be my honor and we did. we went over to line. we turned around. everybody was so happy and many people, i noticed from korea, were literally in tears, crying. it's a big thing. we're now going to work on something. we have a tremendous seem of people that know how to do this. we're going to put them in charge.

secretary of state mike pompeo is here. is he here? where is mike? where is our secretary of state? come up here, mike. and you know who else i have? has anyone heard of ivanka? come up, ivanka. she's going to steal the show. what a beautiful couple. mike, beauty and the beast, mike. you know, we have our great ambassador, our new ambassador, one of the truly great admirals,

harry. thank you very much. you're right over here. look at these two. >> it's great to see you all. it's wonderful to see you mighting men and women. bless you all. >> god bless america. and god bless each and every one of you, for being out here and everything you do, for your sacrifice and your service. we're grateful to you and your loved ones, who serve our nation out of uniform. thank you. >> we expected official remarks

from the president of the united states. but that was ivanka trump. if the president says something of consequence, coming up, we will bring that to you. we had with us, i think we have the special adviser to president moon jae-in. mr. moon, thank you for joining us this morning. >> you're welcome. we heard a strong degree of confidence from president moon, meeting with chairman kim and crossing into north korea, would be performtive in the denuclearization talks. the intelligence director said, that kim jong-un is not ready to

denuclearize. why is president trump so passionately confident that he is? >> if you don't have the conviction that north korea will denuclearize, what option do you have? the north korean leader said, he can willing to give up nuclear weapons and let's take it how it is. >> several administrations in the u.s., have had confidence that north korea would, first, not march toward a nuclear weapon. and now, denuclearize. that has not come to fruition. beyond the confidence, what is the evidence? >> we should make evidence. up to now, north korea has been talking commitment. it is time for us to work on those an crete actions.

that's why president moon had been saying complete denuclearization of north korea would take a longer time. we should start with some concrete result. and president trump's visit to the dmz has all kinds of possibility. >> did you know that kim jong-un was going to walk back into south korea with president trump? >> i was surprised. i thought president trump would step into north korean territory. but chairman kim jong-un, came to the southern part of cree. and had dialogue with president trump, in the freedom house.

that was unusual and surprising on the part of kim jong-un. >> what did that mean to you and to president moon? >> i think the outcome of today, that the demille tear line is an unofficial one. the north and south korea can build a trust. mr. moon, finally, what is the difference between the optimism, the optimism in the hanoi talks, the optimism in the run-up to the singapore talks. what is the new variable that chairman kim will take any step toward denuclearization.

>> kim jong-un, had a proposal in hanoi. they wanted to end actions. if they take actions of dismantling it. that is a significant step toward the north korea. you cannot get everything once and for all. it is too idealistic. but incremental exchange can make, big progress toward concrete denuclearization of north korea. >> the south korean minister, estimated that north korea had somewhere between 20 and 60 nuclear warheads, nuclear

weapons. what is the government's estimate today on how many nuclear weapons north korea has? >> it's like the blind man touching the elephant. american nuclear scientists estimate that the north korea has about 30 to 35. they used to estimate north korea has 10 to 15 nuclear warhead. we don't know. that's why we are talking to north korea. >> we have to let you go soon. one last question. is it your expectation based on the numbers you're giving me since we got that number from the south korean government, that the number of nuclear weapons that north korea has has increased?

>> we don't know. since president trump initiated dialogue with north korea, is an indication that the north hasn't tested ballistic missile and nuclear bombs. north korea might not have stopped production of nuclear materials. we should see. that's why we should talk with north korea. we should make north korea more transparent. >> chung in moon, we appreciate you taking the time to talk to us today, sir. thank you so much. >> thank you. coming up, the south korean president called this a big step forward, as did mr. moon there. what will it yield beyond this photo op? mhm

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a historic moment this morning. president trump took 20 steps into north korea, alongside kim jong-un. he is the first sitting u.s. president to step foot into that country. >> we characterized this, jim sciutto did, as handshake diplomacy, but that resulted into a 50-minute meeting behind closed doors. president trump said they agreed from that meeting to restart nuclear talks. cnn international correspondent will ripley with us now.

i know you are in seoul. what is the meaning of this to the people there? >> well, it's extraordinary. we have a crowd of people around us, who have been watching all afternoon, the news coverage of the historic day. you can feel the energy on the peninsula, like you could last year. after the u.s./north korea summit in singapore. there is, perhaps, a sense of optimism. hope this could lead to a breakthrough. they hope that won't be the case this time. >> a characterization from the president who made me think of seoul immediately. when the president was asked about hort-range missiles, the president said, i don't consider those missiles. the people of seoul would consider those missiles. what has been the reaction to

the tests we've seen? they're not icbms, but still significant close to north korea? >> it's unsettling that north korea continues to perfect missiles. millions have been in the firing line of north korea for years. they have weapons pointed at the south. over the decades, they haven't used those weapons. people live knowing there's a threat. but at is the same time, they don't think it's a corredirect t to them. we heard president trump talking about the spontaneity of this

visit. i just put up a tweet. and he doesn't do anything that isn't unstructured. how do you think this meeting came about? and why is that important? >> if kim and trump are telling the truth, and this is something that came about after president trump sent a tweet, it shows an evolution for the north korean leader. the fact he sat in front of press, and answered questions, is a massively different situation. he has yet to sit down for an interview with a western news organization. that's something that cnn and other network is being hard for. to see him in this environment

is extraordinary. he walked into hanoi as if he was triumphant before the summit took place, and he was dejected on the train, empty- handed. >> will ripley, reporting many, many times. >> it's bring in gordon. you covered the region for quite some time. i want to start with your reaction to what we saw and heard at the dmz. >> everyone is saying this is historic and extraordinary. there's the optimism. but you have to remember, you know, disappointment is a powerful emotion. if the two leaders can't carry this momentum forward, there could be adverse developments

out of this, as there is in the past. this is a great opportunity. a time of great risk. we have to be concerned that this momentum is actually carrying forward. this is the question that i had. chairman kim would meet the president at the dmz. what is the variable at this moment of optimism, that was not present at the time of hanoi? what makes any player believe that this will be more fruitful than it has been? >> i would think that the atmospherics probably probably be better than before. president trump has been quite generous. he has tried to create this favorable atmosphere for kim. eventually trump is going to

lose his patience. and kim jong-un has to understand that. he has a limited period of time in which to make good on promises. president trump's diplomacy is based on the fact that kim jong-un has made a decision to give up weapons. if he hasn't made that decision, and it doesn't look like he has, there is going to be a reckoning. >> you wrote after the hanoi summit, that he is in a system that does not allow him to reciprocate goodwill. >> well, president trump talks about his great relationship with kim jong-un, or with president xi. and they view the statements of friendship to be sipps of weakness. they then try to take advantage of that.

we americans have a notion that you have to have good relations with your counterparties. well, no. a lot of people have a different view of the way diplomacy works. >> the president prioritizes the personal relationship with xi, with putin, and kim and other world leaders. gordon chang, always good to have you. as president trump and kim jong-un have agreed to hold their meeting there, new white house press secretary got into a scuffle with north korean officials. stop. no. i need help here. >> you can hear her saying, let go. we need help here.

the source says she was bruised in that scuffle. this happened as north korea officials were hustling press pool members trying to get into the room for their meet iing. president trump is talking to troops in south korea. here's where he took the first step, the first sitting president of the u.s. to walk into to north korea. we'll talk to our military experts about the president's moment. stay with us. termites. we're on the move. hey rick, all good? oh yeah, we're good. we're good. terminix. defenders of home.

those are pictures of president trump in soet, south korea.

he is meeting with american troops after a meeting with kim jong-un. that was a surprise. >> that tweet that came late friday. the president said, i'll be at the dmz. i would like to be there to shake your hand. and it happened. the only sitting president to take 20 steps into north korea. >> here's general kirkling. i want to get your reaction to today. >> a historic event, christi. how this came about. we have to judge any movement by different societies, regarding war and peace, with regard to risk and rewards.

we have to ask ourselves what caused this, from president xi or the g20 summit. suggests to see president kim. or was this his idea? did it cause him to say we can move the needle forward? our risks are great, giving kim jong-un an increased presence on the world stage. risking the defensive posture of north korea. >> how confident are you that north korea is going to come to the table with president trump and have some sort of substantive change?

i remain kept cskeptical. as we've seen in the past, from a military perspective, we judge things by what has occurred throughout history, and the potential for things happening in the future. hi historically, they have brought things to the table, only to have it squashed, in terms of what could result. we've seen that, in the last two years, as president trump's reached out. that's not any different from any past presidents. that's always their hope, that north korea will come to the table and join the league of nations, as it were. there hasn't been the results coming from those meetings.

north korea wants sanctions released desperately. it depends on what kinds of those meetings, that will get over -- not only that, but how it will come about. this is what i'm talking about. he said, good luck, steve. we don't know how beigun will be. part of it said that kim jong-un received certainly disappeared.

can the u.s. have a successful conversation and negotiation with its nuclear armament, and ignore the human rights va lags in that country? >> what would be recognized as united states values and values by all democratic nations. north korea didn't want to deal with secretary pompeo. that indicates they want the optics of dealing with a leader. if that's what kim jong-un wants, and we can give that to him without giving up on his part, we're just playing his

game. what are we gaining from engagements? photo opes or sanctions relief? are there term gnat iinal indic that he's going to release st k stockpiles. all of the things that kim has promised, has not come true. >> lieutenant general mark hertling, thank you for taking the time to be with us this morning. let's turn to 2020 now and is the second verse same as the first. kamala harris facing criticisms similar to that of president oba obama.

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birther conspiracy over kamala harris. donald trump, a critic of air force, questioned her identity. trump jr. completed it. harris' campaign, has harkined to the birther controversy. >> vice president biden is among the 2020 candidates defending her. the same forces of hatred rooted in birtherism that questioned barack obama's american citizenship is now coming after kamala harris. joe inslee had this to say -- >> it appears that the rotten

apple doesn't fall far from the rotten tree. >> harris was born in oakland, california, to a mother from india and a father from jamaica. in march, she told people what she was. >> i am proud of being black. i am not going to make excuses for anybody because they don't understand. >> raj, good morning to you. >> good morning, victor. >> this tweet going around, this line of criticism misunderstands the blackness in america. the effort from the president's family. we're seeing a repeat potentially, of what they did to

barack obama. >> yeah. there's certain things this line of attack brings up. it's probably a signal to trump's base that kamala harris is a threat to donald trump's presidency. by undercutting her identity and trying to whitewash her blackness is an effort to do that. of course, she was born in oakland. she's a woman of color. the fact that she has roots to jamaica and india, doesn't diminish that she probably experienced the black experience, more than most people. >> is this the white voter who may be uncomfortable with electing -- any voter.

a voter who is uncomfortable with a black president. or potential supporters who want to convince that she is not like you. >> it can speak to the many racists that we have in this country. i'm not 100% sure. there's an effort by people on the far right. when obama was running for president, many people sort of dismissed the fact that he had a white parent, a white mother. it was focused he was the first black president. nobody focused on the fact that he was biracial. kamala harris, also, biracial. >> it's remarkable how we're seeing pushback from other 2020

competitors. i don't know if we saw that after the many times that president trump referred to elizabeth warren as poke hcahon over her heritage. explain the context. >> i think people on the right are going after kamala harris because she had a strong debate performance. to your question, going after elizabeth warren because of her dna tests. her native american roots was how she got away. she's now pivoted to her policy

questions. when it comes to her general election, it will have less of an impact with donald trump because it's about their position for america as opposed to where they came are from. >> the birther movement -- let's see if this moves to the center of the 2020 campaign. >> great to see you, victor. beto o'rourke is making his first international trip as a presidential candidate. why he is heading into mexico today. excuse me, where is gate 87? you should be mad at non-seasoned travelers. and they took my toothpaste away. and you should be mad at people who take unnecessary risks. how dare you, he's my emotional support snake. but you're not mad, because you have e*trade, whose tech helps you understand the risk and reward potential on an options trade it's a paste. it's not liquid or a gel. and even explore what-if scenarios.

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o'rourke will visit mexico, meeting with migrants seeking asylum in the u.s. >> julian astro attempted to visit the migrant detention facility in texas. he was denied. the facility has been accused of housing migrant children. >> julian castro will be a guest on state of the union. aim klobuchar is also a guest. that's "state of the union" at 9:00 a.m. eastern. only on cnn. cnn breaking news. >> good to be with you here on a sunday morning. i'm christi paul. >> i'm victor blackwell. for the first time, a u.s. sitting president met with the leader of knot korea and crossed

into north korea. and the north korean history immediate historical meetings between president trump and kim jong-un. >> good to see you again. i've never expected to meet you at this place. you are the first u.s. president to cross.