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Woodruff president obama went today where none of his predecessors had gone, while in office hiroshima, japan. He sought to navigate between honoring the victims, and standing by the u. S. Atomic bombings that left 130,000 dead, and led to the end of world war two. Warner the nuclear bomb that destroyed hiroshima on august 6, 1945 changed japan and the world forever. 70,000 people were killed instantly. By years end, another 70,000 were dead from radiation poisoning. The city was flattened apart from a one domed building, now known as the atomic bomb dome. It stands as a reminder of the firstever atomic attack on a human population and as a symbol of peace. President obama solemnly paid his respects there today. And with japanese Prime Minister shinzo abe, he laid a wreath at the nearby hiroshima peace memorial. We stand here in the middle of this city and force ourselves to imagine the moment the bomb fell. We force ourselves to feel the dread of children confused by what they see. We listen to a silent cry. Warner three days after hiroshima, a second atomic bomb killed 70,000 more in nagasaki. The u. S. Did it to bring a quicker end to world war two. The president offered no apology today, but renewed his call for abolishing Nuclear Weapons. Among those nations like my own that hold Nuclear Stockpiles, we must have the courage to escape the logic of fear, and pursue a World Without them. We may not realize this goal in my lifetime but persistent effort can hold back the possibility of catastrophe. Warner in an emotional moment afterward, mr. Obama greeted survivors of the hiroshima bombing. Other survivors joined the crowds lining his motorcade route. Fewer than 83,000 are left. translated im very happy to see him visiting here. He has sent out a message for peace in the past and today he is putting his words into practice. translated it would have been much better if a u. S. President s could have made the visit earlier. It took 71 years; i think it could have happened earlier. Warner a Younger Generation brought its own perspective to the visit. translated his visit to hiroshima means a lot, because its a step forward from all the conciliatory rhetoric we have traded so far. Warner but thereve also been protests in the days leading up to the visit and demands for an apology. Of course he will not apologize; simply because if he does, the u. S. Cannot use the Nuclear Weapon again. I believe hes not apologizing here to leave the possibility to use Nuclear Weapons open for the future. Warner even before his election at a 2008 speech in berlin, germany mr. Obama embraced the opposite goal. This is the moment when we must renew the goal of a World WithoutNuclear Weapons. Warner yet now the Defense Department is in the midst of a sweeping upgrade of its nuclear arsenal. The plan is to spend 1 trillion over the next three decades, on new nuclear submarines, bombers and weapons themselves. For the pbs newshour, im margaret warner. Woodruff well look at the Nuclear Threat in the world today, after the news summary. The events at hiroshima came after Major Economic powers wrapped up a twoday group of seven summit in japan. In a warning aimed at china, the leaders opposed unilateral actions in the east and south china seas. Instead, they called for peaceful resolutions to territorial disputes. Beijing responded that the gseven should stick to economic matters. There is word that iran is honoring all its major obligations, under the nuclear deal it signed with world powers last year. The Associated Press obtained the confidential assessment by the u. N. s nuclear agency. It says tehran has now corrected a previous violation. Under the deal, iran won relief from International Sanctions in exchange for limits on its nuclear activities. The u. S. President ial campaign was strictly a west coast affair today. All three candidates campaigned with an eye on the calendar and the date of june 7. Lisa desjardins has our report. So i want to make a big play for california. Should i . Reporter one day after clinching the g. O. P. Nomination, donald trump kept up his push for the golden state. Outside his fresno event, protesters kept up their push too. But elsewhere, trump gained new if lukewarm words of support from a former opponent, florida senator marco rubio. I dont want Hillary Clinton to be president. If theres something i can do to help that from happening, and its helpful to the cause, id most certainly be honored to be considered for that. Reporter trump, too, is talking about Hillary Clinton. The Inspector General whos a democrat did a big, big number on her. I dont know how she can continue to run, ill be honest with you. How does she continue to run . Do you think hillary looks president ial . Crowd nooo reporter like trump, the two remaining spent their campaign day in voterrich california, with polls showing a much tighter race, as the june 7 primary nears. Bernie sanders went big, rallying with Union Workers on the san pedro waterfront. You and i are going to have to tell the billionaire class they cannot get it all. That this economy and government belong to all of us. It is an absurdity that you have multibillionaires like Sheldon Adelson contributing large sums of money to another billionaire, like donald trump. Reporter Hillary Clinton met with Community Leaders in oakland, hitting again at trumps temperament. You know, i like to say, yes, we can use the white house as a bully pulpit. We dont want a bully in the white house. But we can use the bully pulpit to talk about issues and bring lets begin to cut across all the barriers the geographic barriers and Everything Else that stands in the way. Reporter for now, whats standing in clintons way is the number 73 as in, the remaining delegates she needs for the nomination. For the pbs newshour, im Lisa Desjardins. Woodruff eight automakers are recalling more than 12 million vehicles in the u. S. To replace the air bag inflators. The devices made by the Japanese Firm takata can explode with too much force. They have been linked to at least 11 deaths worldwide. The new recalls are part of an expanded Campaign Announced earlier this month. The u. N. Refugee agency is urging hungary and serbia to help migrants now camping in desperate conditions. Theyre on the serbian side of the border, blocked from moving north by the fence that hungary put up last year. U. N. Officials say some 300 migrants are living in tents there. They have no access to toilets or running water, and have to rely on aid groups for food. Nearly 40,000 verizon workers may be back on the job in the eastern u. S. Next week with a new fouryear contract. The company and its unions reached a tentative deal today to end a strike. Landline and cable employees walked off the job april 13, in nine Eastern States and the district of columbia. In economic news, growth ran at annual rate of eighttenths of a percent in the first quarter. That is relatively weak, but better than the initial estimate. And, Federal Reserve chairwoman janet yellen said today she expects another Interest Rate hike before long, if Growth Continues to improve. On wall street, the Dow Jones Industrial average gained 45 points to close at 17,873. The nasdaq rose 31 points, and the s p 500 added nine points. For the week, the dow and s p 500 gained 2 . The nasdaq rose 3 . Still to come on the newshour a look at the worlds Nuclear Reality 70 years after the u. S. Dropped the atomic bomb; one japanese mans quest to remember the 12 american p. O. W. s killed at hiroshima; a top chefs solution to food waste, and much more. Woodruff we return to the president s visit to hiroshima with a look at his Nuclear Legacy and the ongoing threat from those weapons for that we turn to Stephen Rademaker, who was assistant secretary of state for arms control and nonproliferation during the george w. Bush administration; and rachel bronson, who is the executive director and publisher of the bulletin of the atomic scientists, which focuses on Nuclear Weapons and disarmament. And we welcome both of you to the program. So we did hear president obama today in japan repeating the goal that he laid out he first laid out when he came into office. He said the nations that hold Nuclear Stockpiles must have the courage to pursue a World Without them. Rachel bronson, how has the president done on that front . Well, i think the president started off very strong. Obviously, you mentioned his prague speech in 2009, but its a strange bookmark to come out at the end of it today, towards the end of his administration. Weve had enormous progress in the first part of his administration and much less in more recent years. So some big victories early on, i do think important agreements like new start and the iran deal, but then slower progress in the last few years. Woodruff how would you rate the president s progress on this, Stephen Rademaker . I would say the goals the president set for himself in the prague speech were completely unrealistic, so its not surprising having confronted reality during the course of his administration hes had to back down from the unrealistic aims. He donts articulate the abolition of Nuclear Weapons as a goal, but in 2009 when i think he was sincere and he thought this was achievable, he said today he wants to abolish Nuclear Weapons in the way other politicians say they want to abolish poverty or eliminate drug addiction. Its an apirgs into something we understand is not going to be achieved anytime soon. Woodruff rachel bronson, what do you think the president should have done and what do you think his successor should be doing . Well, i think what he likely needs to do at this point is we need, as a country, to kind of take a look at this massive Modernization Program that the president is undertaking. So in an effort to reduce the number of Nuclear Weapons around the world, he engaged with the russians and signed an arms deal to help reduce what we had around exactly what he set out to do. But to get that he had to make a deal, which was that he was going to invest in the modernization of our nuclear arsenal, which he has done. But looking at that very hard, what it begins to look like is not just modernization, not just keeping those weapons safe, so that we dont rust our way to disarmament which would be very dangerous, but seems like were actually building a new fleet, and the kinds of money, the budget has ballooned, so the e president is really going to have to take a hard look at how do we get back on pace to make sure that not only do we continue to decrease numbers but that our arsenal isnt becoming stronger, bigger, you know, more threatening. Woodruff Stephen Rademaker, how do you look at what the president should have done differently . Well, if you accept the fantasy were about to abolish Nuclear Weapons, then, of course, spending a trillion dollars to modernize is a waste of money. The reality is, as the president recognized, were not about to eliminate Nuclear Weapons. Theyre going to be around for a long time, so it is necessary to make the investments in modernization. I know this number 1 trillion gets thrown around. If you want to deceptively present any budget number, you wont give the one number, you will give the 3 30 year number because its vastly larger. It worked out to 5 of the defense budget, what we spent in the cold war, its veal tifl small. Woodruff rachel bronson, when you compare where the world is today with where we were 25 years ago at the end of the cold war, has there been progress made when it comes to Nuclear Weapons from your perspective or not . Yeah, there certainly has been progress but just picking up on where steve was, it is important to note the military itself is beginning to balk at the prayin at the price tag e beginning to say it has to come out of different pocket, not our budget. So theyre balking to the costs are really escalating and it seems beyond our ability to afford and if we are affording, we wont do other things the military wants to do. There is a lot of concern what this is going to cost and at what cost to other kinds of tasks and other weapons that the u. S. Might be want to be investing in. So i think i wanted to make that point. But in terms of where we are from the cold wax we have seen massive reductions and important reductions. Weve also seen progress beginning to move highly enriched uranium, plutonium out of certain countries. The president has moved the needle positively in directions that have made the world safer, but, you know, this is a new world, and were entering a new world where more countries have Nuclear Weapons, we have to worry about nonstate actors who try to get their hands on them. So in terms of a strategic threat, its going down to some extent, but, you know, this is a new world, and were in a very dangerous position. We moved the Doomsday Clock from thrive to three minutes to midnight a year ago and cet it at three minutes to midnight. We have deteriorating relations between the u. S. And russia and this Modernization Program is very concerning. Woodruff i want to get back to Stephen Rademaker. You can respond, i dont think the two of you r going to come together, but in determines of whether the world was safe than at the end of the cold war when the u. S. And soviet union were then armed to the teeth. I think were at better place than at the end of the cold war, but lets be clear, there hasnt been much progress during the Obama Administration on the elimination of Nuclear Weapons. I think rachel would agree. Russia deploys 200 more Nuclear Weapons today than did when president obama took office. Thats according to the official data declarations. China has recently started testing independently targetable reentry vehicles. Its deploying a mobile i. C. B. M. System. It just deployed within the last year the first operational submarine lawnable missile. To the Chinese Military is increasing. President obama obviously believes in it with all his heart but the rest of the world does not. He does not have a partner in moscow willing to join him in this enterprise. Woodruff a lot of big questions, and we wanted to take a look at it this day the president visited hiroshima. Stephen rademaker, rachel bronson, thank you both. Thank you. Woodruff now a different look at the aftermath of the hiroshima bombing, and a story rarely told. John yang has that. Reporter among the thousands killed at hirosha were 12 american prisoners of war the crew of three planes shot down. Today, president obama noted their deaths, as well as the quiet, diligent and four decadeslong effort of one man, shigeaki mori, a survivor of the bombing, to memorialize the 12 americans. Mori attended mr. Obamas speech and the two men embraced. Now, a new film called Paper Lanterns charts moris quest as he sought permission from two of the families of the 12 p. O. W. s to register their names for a memorial. Here is a clip from the film, where ralph neal of kentucky and Susan Brissette archinski of massachusetts read the letters mori sent them seven years ago about their uncles. Dear mrs. Susan Brissette Archinski dear mr. Ralp ralph neal. I hope this letter finds you well. My name is shigeaki mori, a 72yearold b bomb survivor a bomb survivor and historian living in hiroshima. For a long time i have been reading about american soldiers killed by the atomic bomb. I have erected a memorial to their death. The 64th anniversary of the abomb is coming soon. On this day every year, Memorial Services are