teacher, and the kids recognize his bravery. >> that's really aside from trying to come to grips with what happened at their middle school, that's almost everything that we are hearing from these kids here talking about 29-year-old jason seaman. he was a science teacher. this shooting happened in his classroom. according to the students, they were taking a test and the shooter asked to be excused. when he came back into the classroom, the students say that he had two guns, two handguns, one in each hand and began shooting. they say that their teacher thought quickly. he grabbed a basketball, he threw it at the shooter, trying to stop him, at the same time running toward him and using his body to disarm that shooter. >> he walked in and he just had the gun in his hand and started waving it around. he took about like four to five, maybe six shots. >> and he started shooting at mr. seaman. and everybody started screaming and freaking out.

and mr. seaman ran up and tackled him and secured him. >> and then he started screaming to call 911 and get out. we realized that he got him to the ground and the gun was out of his hands. >> jason seaman is still in the hospital. according to a post from his mother on facebook, he was shot three times and is recovering, in the abdomen, the hip and the forearm. he did release a statement, fred, basically saying i want to thank first responders and telling the kids i do this for you and i want to thank all of you and i love you. most people who know him say they're not surprised by this at all, that he is a good person and they think this is something that he would do. he was a college football player. he used his body, they say, to save his students. >> not to undermine anything he did, but that does exhibit the heart of so many teachers. >> to automatically do something like that. it's a shame they have to think about it at all. >> he's an amazing hero. thank you so much, appreciate it. still ahead, the north korea summit and the tumultuous back

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needed. wrong again. use real people, not phony sources. but according to cnn reporting, this official, a real perpendiculperson, a real source, said this in a background briefing on thursday. in the meantime, the white house says its advance team is heading to singapore as previously scheduled. i want to bring in jack kingston, a former georgia congressman and senior advisor to the trump campaign. he is now a cnn political commentator. nina turner is a former state senator from ohio and cnn political commentator. good to see you both. >> good to be here. >> jack, you first. with this summit still up in the air, perhaps it's on again. do you think president trump and kim jong-un will be able to come to some kind of agreement at least to meet? >> i think they will. you know, the president has been focused on north korea not just in the last several months, but it was one of his first diplomatic foreign policy decisions to start putting pressure on them. they have had steady diplomatic

pressure and economic pressure. so when we were in the position last summer of a lot of rhetoric going back and forth, everybody says this is horrible, this is disastrous, but i think it was paving the way for an ultimate summit. i hope that it will be june 12th, but i'm okay if it's later. i do think it's going to happen, though. >> so, nina, is this strategy, was there a misunderstanding, were there certain requirements that weren't met as to why it was off and now potentially on again? >> well, we don't quite know, because the president makes these snap decisions that many times don't make a whole lot of sense. the most important thing is hopefully the president is stepping back from this. hopefully he's talking with our allies in the international community. this could be the opportunity to really do this and to do this right. it certainly is encouraging what is happening between president moon, who really has been the leader over there, trying to make things happen between north

and south korea. you know, them signing the treaty, the korean war, the peace treaty, the korean war that happened in 1953, that there had never been a peace treaty signed so there's good signs over there especially because of the leadership of president moon, but it is our hope and anybody's hope that cares about peace that our president will get this right and not play games with this. this is serious business in terms of dealing with a country that is led by a president such as kim jong-un and the nuclear capabilities that they have. >> i did wanti to say that ther were reasons that president trump acted to cancel the summit. one was that when they exploded four of the tunnels, two of them were reusable so they were exploded but not permanently exploded. also kim jong-un denounced a routine military training exercise as a provocative act of war, which was not true. they insulted president trump, which is not helpful, not constructive. but the other thing and people haven't discussed it, is the

logistics team went to singapore as planned to sit down with the north koreans on just the normal logistics and the north koreans did not show up. our team sat there for three days without the north koreans being there. i think the president wanted to accepted a signal that, look, we're not going to play games about this. >> the insults have been going back and forth so that certainly can't be the breaking point. david sanger wrote in "the new york times" saying this, and i'm quoting now, that mr. trump, mr. bolton and secretary of state mike pompeo had one vision, what they called complete verifiable irreversible denuclearization, but it was a one-sided affair. never once did they raise the likelihood that the united states would have to give something up too. so, nina, was this something, an element, a realization perhaps and then the white house said we're going to call this off because right now we -- perhaps

we didn't do all of our research or homework and now we've got to reset? >> yeah, and that's why we should be concerned. listen, the relationship is fragile. it always has been. that is why it's incumbent upon president trump not to play games with this. the people that lead him and advise him to make sure that we are doing the right thing and not making snap decisions and not pulling back and pulling back in. there are some people in the international community that are really concerned about this on again, off again. this is real business, the business of peace. the business of diplomacy. all of these things are real. they have real consequences. the united states should lead. we should lead in a way that is diplomatic and we should lead in a way that is strategic and not make snap decisions. >> the president used the word game, that everyone is playing a game so to speak. >> well, he's playing the game. he's the one that's playing the game, that's the problem. we really need the president and his advisers to take this seriously. the world depends on it. i'm really glad to see, again,

president moon stepping up and being the adult in the room. >> i think there is a legitimate question for north korea. okay, what is the future of the united states troop strength in south korea if we do nuenuclear and you still have these troops there that we don't trust and what will our future be like. that's something both sides will have to face and say, okay, if you denuclearize are we willing as a country to send our folks home. i don't know that we're there yet. >> are all of those things to consider or discussions to have but perhaps not in the public stage? perhaps those are discussions or things you work out before it's publicized that there could be a meeting, jack? >> i think that -- you know, if you think about today's social media environment, not just today, it was when reagan in 1986 walked out, there were a lot of arm chair quarterbacks who said right thing, wrong thing. it's almost like going to a

football game. i am glad that, say, the university of georgia coach kirby smart doesn't listen to all the fans. as meaningful as we are and as great experts that we are sitting in the gallery, i don't think he should listen to us. i think the president has to be very close with his information and with his advisers on this and not listen to the noise on any side. >> all right. we'll leave it there for now. jack, nina, thank you so much. >> thank you. and this just in to cnn. the fourth man to walk on the moon, alan bean, has passed away at the age of 86. a look at this iconic photo from nasa. bean was the last surviving member of the apollo 12 team. his family says bean suddenly fell ill after traveling two weeks ago. he died at houston methodist hospital today. his death leaves only four other astronauts alive today that have stemmed foot on the moon. we'll be right back.

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for decade, theories over who killed robert kennedy have puzzled investigators and legal analysts. now a new report in "the washington post" quotes one of his sons questioning whether the man convicted for the shooting is actually responsible. robert f. kennedy jr. says he met with sirhan sirhan who has spent the last 50 years behind bars for the murder of the presidential candidate. after years of his own research,

kennedy believes a second gunman is to blame. in "the post" story, kennedy is quoted as saying, quote, i went there because i was curious and disturbed by what i had seen in the evidence. i was disturbed that the wrong person might have been convicted of killing my father. my father was the chief law enforcement officer in the country. i think it would have disturbed him if somebody was put in jail for a crime they didn't commit, end quote. here with me to discuss now, cnn presidential historian, tim neftali. tim, is there evidence to suggest a second shooter? what do these thoughts from robert kennedy jr. say to you? >> well, fred, i think it's always important to show respect to families of those who were political figures, families of political figures who were felled by violence. the king family, for example, has questioned the official account of james earl ray's

assassination of their father. and so rfk jr. has been raising questions for a number of years. the challenge for anybody trying to figure out whether a conspiracy is behind a political assassination is to put together the evidence and to try to find a link between a conspiracy and the ultimate action. the challenge for those studying the rfk assassination is sirhan sirhan who went to jail for the assassination confessed to it. there were notebooks that he wrote before the assassination in which he wrote that he wanted to kill robert kennedy and he wanted to kill robert kennedy on the anniversary of the six-day war. sirhan sirhan was from palestine, the palestinian mandate, and he was very much against robert kennedy's support for israel at the time of the six-day war. we also -- the assassination took place in a very crowded

area. this wasn't like 1963 with john f. kennedy being shot from far away. there were a lot of eyewitnesses. two of them, rayford johnson and rosie greer are still very much alive. they tackled sirhan sirhan because they thought he shot the fatal shot. by the way, he certainly did shoot somebody because his gun was used. so the issue -- >> robert kennedy jr. is talking about a second person. >> you would have to say that there was a mystery person who just disappeared. sirhan sirhan has not explained what conspiracy was behind him. in fact his defenders say he was in some kind of a trance, that he didn't even know what he was doing. >> do you think this case would be reopened? >> well, i mean if -- look, i'm a historian and i'm always an open-minded skeptic about these things. if there's good, new evidence, yes, you must. if there isn't, then we have to move on.

my point here is conspiracies have to be plausible. you've got to be able to walk through from beginning to end. that's why the jfk assassination conspiracy falls apart. i don't know about this case but there are a lot of stubborn facts that make it look like he was the lone gunman. >> we'll leave it right there. of course the assassination of bobby kennedy took place in 1968, which was a year that changed america forever. cnn's new two-night original series event, "1968" explores the icons and the milestones of that pivotal year. here is cnn's tom foreman. >> reporter: outrage over racially charged deaths, violent clashes between police and the african-american community. >> all black men don't have to die! >> reporter: and demands for fair, equal treatment, all part of a struggle for social justice now. but that modern movement owes

much to the 1960s when a great many similar scenes unfolded. throughout that decade, friction had been building over integration, voter rights and disparities in education, work and housing opportunities. >> freedom comes to us either by ballots or by bullets. >> reporter: the slaying of malcolm x, the black panthers and a rising sense of iet saw the landmark book "soul on ice" appear. they raised their fist against racial inequality and it all came to a head -- >> of the freedom of assembly. somewhere i read of the freedom of speech. somewhere i read that the greatness of america is the right to protest for rights. >> reporter: when the assassination of martin luther king jr. in memphis triggered an outpouring of grief.

>> persons have been treated for injuries, among them several policemen and firemen. >> reporter: protests ripped through dozens of cities. the nation's capital, washington, d.c., exploded into four days of fury. >> at one point early in the evening, more than 100 fires were burning, some of them in an area just 20 blocks from the white house. >> reporter: today a monument to the slain civil rights leader stands near the very spot where he led marches and prayed for nonviolent change, not far from the smithsonian's new african-american history museum. they are both tributes to the past, but also for many civil rights advocates, they are reminders too that the passionate calls for change in 1968 are echoing still. tom foreman, cnn, washington. and don't miss "1968" tomorrow, 9:00 p.m. eastern right here on cnn. and thanks for being with me today. i'm frederica whitfield. the next hour of the cnn newsroom starts right after this. it's absolute confidence in 30,000 precision parts.

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and you are live in the cnn newsroom. i'm ryan nobles. it is our breaking news right now, an american man locked up in venezuela for nearly two years is free. he is on a plane headed for the united states. joshua holt, 26 years old from riverton, utah. he and his wife were arrested and thrown in jail in 2016 accused of hiding weapons. he never even had a trial. in a few hours, both will be back on american