Newsroom starts right now. A very good day to you. We begin this hour with the race for the white house and donald trump, this week, he keeps generating the headlines. He is refusing to release his tax returns. At least for now saying that his tax rate is no one elses business. And remember his proposal on banning muslims on entering the u. S. Now the Presumptive Republican nominee says that was just a suggestion. And trumps butler who for nearly 30 years said president obama should be killed. The candidate has days vowed the cynical comments. And the Washington Post just releesed an audio recording from 1991. And on it a man calling himself john miller claim be to be trumps publicist, brag be about the billionaires success in business and his sex life. Trump says its not him. Our drew griffin as more and expert voice analysis. Reporter the real donald trump, and the spokesman writes maybe because its been an open secret for so long. Whats your name . John miller. Reporter it was back in the 1980s and when the flashy real estate mogul needed to get a bit of news out. The newspaper report says it was Common Knowledge among reporters that trump assumed different names and handled the media calls himself. Like this reporter, sue carswell from People Magazine regarding the breakup of marla maples. What kind of comment is comes from the trump team . Well, it was just that he really decided that he wasnt. He didnt want to make a commitment. It was too soon. Hes coming out of a marriage. Reporter if that john miller sounds like trump its because audio forensic expert john owen says in his opinion it is. I can conclude with a fair degree of scientific certainty it is Donald Trumps voice. Reporter this afternoon, owen compared john miller with that phone call with people to the real donald trump interviewed on Cnns Larry King live in the 1990s. I dont talk about relationships. Reporter due to the default. Old recordings, he couldnt use his bio in the trick analysis that he says would be absolutely certain, but based on pitch, tone, cadence and his expertise, john miller and donald trump are one and the same. Im confident that its donald trump based on my analysis of the critical listening. Listening of the two recordings. And may drawing a conclusion based on various factor, pitch,. Reporter trump admitted using one of those names on occasion saying i believe on occasion i used that name. Trudge was confronted with the taped phone call and the Washington Post story on fridays today. No, i dont know anything about it. Youre telling me about it for the first time. And it doesnt sound like my voice at all. I have many, many people trying to imitate my voice. You can imagine, this sounds like one of the many scams. Doesnt sound like me. Reporter drew griffin, cnn, atlanta. The love and hate of donald trump has been described as a political bulldozer. It has us wondering whether trumps rise is more than that or much broader around the world. A cnn political analyst joins us like from london. Ron, its always good to have you with us. Good morning. To point out in your article, europe, as an example, many countries in the middle of a nationalist wave from poland to denmark, conservative pup popu parties have taken aim. Explain whats happening . I found like after a week in europe this week, that the uniquely squats of donald trump, i think you see in a number of countries across the continent, the appeal of this insular nationalism to voters who feel culturally energied and eclipsed. You see them making similar arguments against donald trump, against immigration, against globalization. As you noted across the continent. And its a phenomenon of almost the flip side as the world becomes more integrated. Youre seeing the bash lash of those who feel left behind, often in the white working class. And that same impulse that is powering donald trump is powering political movements from the afd to the Freedom Party in austria to marie la penn in france. Its clearly a phenomena that is with us for a while. You mentioned marie le pen in france. Does this swing the anger, the feeling that voices are not heard, does it swing also to the left . Do you see the same thing happening, and i ask you your thoughts on this in the uk with Jeremy Corbin and labor, does it play the same . Right, what youre seeing to some extent san erosion from the center from both sides. Certainly, the key message of primaries, for example in the u. S. , ive been covering american politics, and i think 20 or 25 years ago, its inconceivable that candidates like donald trump and Bernie Sanders have advanced as much as they are. Would consider them outside the range of plausible candidates who they can imagine as president. As you see economic frustration grow, millennial voters are not doing as well as their parents, they are more willing to consider alternatives outside of the usual boundaries of our political debate. While not an expert on the politics of every country in europe, you can imagine that same kind of phenomenon. Conventional politics does not produce answers to the challenges that people face. Particularly growth in living standards. The audience brought from the message grows. Ron, i want to get your thoughts on the latest controversy and donald trump and this person john miller. Yeah, yeah. What do you think, does it sound like trump, first of all . Yeah, it sounds like trump. Also his verbal ticks. The kind of words he uses, the construction of the sentences. I think its a remarkable chris salization of this campaign where i think for the republicans who are hesitant to align helms with trump, a big reason they are hesitant is they simply have no idea whats coming next. Whats coming next from his past. Or whats coming next out of his mouth. You know, what he will say next, what he will do next. And the idea of aligning yourself with the candidate, particularly one of the Senate Candidates running on the swing states in the u. S. Will be on the ballot this fall. And then having to defend things that donald trump has done is unnerving to elected officials. Thats why you have this remarkable situation where you have the unsteady embrace of the presump tip nominee of the party in a way unlike anything ive seen before in 30 years of american politics. Ron, quickly do you think this one hurts him . Well, look, i think it does. Certainly for his core voters, as we were talking about before, the fact that hes delivering this message and saying things that no one has said out loud about immigrants and in some cases about the Global Economy say powerful appeal. One of the two core problems donald trump nations in the general election is among less ideological voters uncertainty over whether hes personally suited as president. I think this makes him look a little more unreliable. Unpredictable. One thing that people like in a president is steadiness. Ron, stand by for a moment. Id like to get your thoughts about the democratic nomination it is still on depending on who you ask. Critics of Bernie Sanders say its mathematically impossible for him to catch Hillary Clinton. With the superdelegates pledged to clinton, shes less than 150 from the nomination. And sanders says he is not going anywhere. Sanders says he hopes it will be his party doing that instead, listen. And what the Democratic Convention is really going to have to think very hard about, including the over 400 superdelegates who came on board secretary Clintons Campaign even before i got into the race or anyone else got into the rashgs they arace, they are goi have to make a determination, which candidate can most effectively defeat donald trump. And i think the answer is Bernie Sanders for two residence. Number one, its all of the polls. Number two, our campaign is generating the energy and enthusiasm that will lead to victory in november. So, ron, again, lets talk more about this, bernie sand serious hoping to push this well into the convention and hes counting on the superdelegates and wanting to put pressure on them what do you make of this play . First of all, viewers around the world have to understand that the superdelegates are doing what they were created to do they were created after the 1980s election after the era produces George Mcgovern in 1972 who couldnt win and jimmy carter who won in 1976 but couldnt govern. In each case, nominees thrust forward from outside of the center of the party. The superdelegates were created after 1980 to give the Party Leaders a greater say and put a barrier in the way of candidates precisely like Bernie Sanders who were kind of a grass movements candidate that the Party Leaders had questions about their viability and the general election and governing. Theyre doing exactly what they were designed to do. The question whether Bernie Sanders would be a general election candidate than Hillary Clinton is very much an open one. Really, no one has spent any money raising the question about Bernie Sanders if he was the nominee. In particular, it would increase spending by 40 pus by the highest level of a share of our economy since world war ii. I think after 200 million of ads making americans aware of that and the taxes that go along with it he might look very different as a general election nominee than today. Sanders said if he is not the person picked as the nominee, he could consider talking to clinton, the possibility that the two could run together. What are your thoughts . That is a pretty old ticket. I dont see that in the end. Bernie sanders has done really well, better than anyone including his own staff, had originally thought. Hes dominated among young voters. Hes won 71 of voters under 30. A higher percentage than barack obama against Hillary Clinton. More so, hes done well in the working class voters. Hes beaten Hillary Clinton in every state out of the south except ohio. So he has a place at the table. I think shes going to have to look elsewhere. I cant imagine it would be him himself. Ron brownstein, thank you for your insights. Man, it san interesting election cycle. Six more months to go. Yes, well have to watch. Youre watching cnn newsroom still ahead, leaders around the world are meeting in nigeria to develop a strategy to defeat the terror group such as isis and boca haram. A live report on that meeting as cnn newsroom continues. Plus, Osama Bin Ladens son all grown up and calling for new attacks where the al qaeda heir wants jihad. What if one piece of kale could protect you from diabetes . What if one situp could prevent Heart Disease . One. Wishful thinking, right . But there is one step you can take to help prevent another serious disease. Pneumococcal pneumonia. If you are 50 or older, one dose of the prevnar 13® vaccine can help protect you from pneumococcal pneumonia, an illness that can cause coughing, chest pain, difficulty breathing, and may even put you in the hospital. 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Why is it all mimics a stomach grumble no more questions for you ooph, that milk in your cereal was messing with you, wasnt it . Yeah, happens to more people than you think. Try lactaid, its real milk, without that annoying lactose. Good, right . Mmm, yeah. I got your back. Lactaid. Its the milk that doesnt mess with you. Wannwith sodastreamter . You turn plain water into sparkling water in seconds. And because its so delicious, youll drink 43 more water every day. Sodastream. Love your water. Welcome back to cnn newsroom. Im George Howell. The president of nigeria me hamed abuhaji is hosting a summit in the next few hours. The focus will be the terror groups such as boca haram and isis. And president and secretary of state and other World Leaders are all attending the event. The index named boca haram the Deadliest Terror Group in the world. They are estimated for killing an estimates 20,000 people. Since 2009, the group has pledged its allegiance also to isis within the last year. What weve seen are reports of more cooperation of reports between them. What weve seen is boca haram itself being more sophisticated in its messaging or propaganda if you prefer. That bears the hallmarks of daesh that is sophisticated in doing that. And also boca haram fighters within libya with daesh fighters. These are all elements that suggest there are more contacts and more cooperation. And this is, again, something that were looking at very, very carefully, because we want to cut it off and prevent it from going any further. Lets bring in David Mckenzie who is following developments in johannesburg. As they continue to focus on boca haram and the continuing ties to isis, what plans are we expecting to hear from them . Reporter well, george, certainly, theyre going to be talking about the gains made against boca haram in recent years. Certainly, theres some level of optimism that the military strategy at least has been working to some level. Boca haram has had its area of territory that it controls in the basin and northwestern nigeria reduced somewhat because of the Strong Military push of these countries involved in the task force. But as you heard from the u. S. State Department Official there is a great deal of worry that boca harams ties with isis. Are deepening, particularly in that corridor through libya. Both in terms of personnel going up. And potentially weapons and training coming down to that part of africa. As you mentioned boca haram is the Deadliest Terror Group in the world. There has been some talk by Nigeria Military that defeat is near. Most analysts say that is definitely talk, very optimistic indeed. As they push into territories theres an increasing likelihood that devastating attacks by boca haram could increase what weve seen in towns or villages throughout that region in the last few years that have had a huge impact on ordinary citizens destabilizing frankly an entire region. David, lets also talk about this report from Amnesty International focused on a Detention Center in that area. What are we hearing from the government, their response, about the situation there . Well, in northeast nigeria, that was where the amnesty focused its report that there are allegations or putting on allegations of human rights abuses including deaths in that camp. Now that camp is organized by the nigerian military, holds people suspected of being potentially a part of boca haram. Now Amnesty International says theyre not treating people with care and theres these abuses there. But they say they are looking into improving the situation. Nigerias president told cnn that they are going to investigate this report. It must be said there have been allegations of human rights abuses since the boca haram insurge against that 2009. They have been frequently denied by the nigerian military. And they say that it is paling in comparison to the level of atrocities committed by boca haram on the citizens of that region. But it is something that amnesty is saying is unacceptable and needs to be fixed. David mckenzie following these stories in johannesburg. Hezbollah is blaming Sunni Islamist extremes for the death of a Top Commander in syria. The group says he was killed in an artillery attack. Hes believed to be responsible for hezbollahs military operations inside of syria. The group is fight on the side of the syrian regime. The u. S. Suspects he was involved in the bombing that killed former lebanese Prime Minister rafik what receivery in 2005. The son of late al qaeda leader Osama Bin Laden is call for new taxi on israel and the United States. In an audio recording, he called for jihadists in syria to unite. Cnns brian todd has more on what some are calling al qaedas crown prince. Reporter he has the name and perhaps the message al qaeda needs to rejuvenate its floundering terror brand. One of Osama Bin Ladens 11 sons for years had been missing off the grid. Now a new audio message released from the son of the mastermind has u. S. Officials concerned. The chilling recording calls on all jihadis to unite, apparently al qaedas rival isis. A key goal bin laden said should be to defeat the u. S. And israel. Those who support the jews must pay the bill with their blood. Reporter the younger bin laden is believed to be in his early to mid20s. Eye u. S. Official tells cnn he has a relatively small role in al qaeda now but could be getting groomed for a leadership position. Analysts see him as the crown prince. Analysts say this is the new bin laden that is going to ultimately lead us in the of