President ial frontrunner donald trump. He called both the deal and the americans who negotiated it incompetent. Major garrett tells us trump vowed things will be different if hes elected. We will have so much winning if i get elected, that you may get bored with winning. Believe me. applause i agree. Youll never get bored with winning. We never get bored. Reporter trump called the deal a disgrace. What will you demand in the deal that isnt there now if you are elected president . You watch. Youve going to have to watch. Reporter cant you tell these people. Let me tell you. I dont want to say things that the other side is going to learn everything about me. Do you understand that . Thats part of the problem. Everything is talk in this country. They talk and talk and they say this is what theyre i dont want to say eye will tell you, that deal will be totally renegotiated or worse, or worse. Reporter or worse for who . For iran, not for us, believe me, for iran. They have suckered us. They have taken advantage of student people, stupid representatives, people that are incompetent, whether its kerry or our president. Reporter texas senator ted cruz, also running if are the g. O. P. Nomination, was trumps warmup act. Cruz said even though Congressional Republicans do not have support sufficient to block the agreement, g. O. P. Leaders should postpone a vote because they have not seen all the fine print. Wont it be the same result . Democrats will not move off the support of their deal. The president lacks the authority to lift sanctions until the expiration of the congressional review period because he refused to hand over the side agreements, the congressional review period hasnt started yet. Reporter new comments from irans Supreme Leader that the country will not cooperate with the u. S. On any other issue and that israel will not exist in 25 years. Democrat Hillary Clinton repeated her support for the Nuclear Agreement today, but added this warning to iran about noncompliance i will not hesitate to take military action if iran attempts to obtain a nuclear weapon. Reporter the nuclear deal is eye allegiance item for president obama to be sure, but it will be up to the next president to implement many of its details. And, jim, there are already warning signs. The United NationsNuclear Watchdog agency says iran has provided incomplete answers about its past pursiewft a nuclear weapon. Axelrod major, thank you. Hillary clinton, who hopes to be that next president , is trying to put an end to the email controversy thats jeopardizing her chances. Shes now done something she long refused to do apologize for using a private email server while she was secretary of state. Heres nancy cordes. Reporter it took six months to get from this. I saw it as a matter of convenience, and it was allowed. Reporter to this. That was mistake. Im sorry. That. I take responsibility. Reporter the course correction came after more defensive answers and halfapologies failed to put issue to rest and after a focus group in New Hampshire reportedly revealed that clintons email troubles were drowning out her message. On tuesday, clinton tried dancing her cares away at a taping of ellen, but the issue surfaced even there. I made a mistake and im sorry for all the confusion that has ensued. Reporter she followed that up with a contrite letter posted on facebook admitting, i could have and should have done a better job answering questions earlier. Democratic strategist steve mcmahon. Do you think people will buy that this is a true apology . I think it would have been better if the apology had come sooner, but i dont think that will make it ineffective. Thank you, thank you. Reporter the evolution in her answers brought back bad memories for siewrpts who saw a similar pattern play out in the 2008 campaign over her vote to go to war in iraq. Why cant you just say right now that that vote was a mistake . Well, if i think that if you look at what was going on at the time. Reporter it wasnt until 2014, six years later, that clinton acknowledged in her book hard choices that she got it wrong plain and simple. Some believe that her refusal to admit that earlier cost her votes, and eventually, the nomination. Her slide in recent polls had aides worried, jim, that she was falling into some of the same traps that the campaign had vowed to avoid this time. Axelrod nancy cordes in our washington newsroom. Thank you. On the campaign trail, donald trump talks a lot about the threat china poses to the u. S. Economy. It is a big issue for farmers in iowa, and jan crawford is there. In about three weeks these will turn yellow and then brown, and be ready for harvest. Reporter soybeans are a mainstay of iowas economy with farmers like ron heck helping drive the States Economic engine. But today, china is holding the keys. These beans could be in china. They could be, two months from now. Reporter they leave the farm on freight trains bound for the west coast and then by boat to china, a system so efficient, china has become a Major Customer of iowa agriculture. Last year, iowa exported nearly 1 billion in products to china, 240 million were soybeans. Farmers here put it in different terms, one of every four rows of soybeans goes to the chinese. But there are growing signs of trouble. Chinas economic slowdown already has hit wall street. On the president ial campaign, donald trump warns about the threat from china every chance he get. Im not going to let china rip us off. Reporter and no one is watching more closely than the farmener iowa. Economist chad hart is a professor at iowa state. If china really slows down here, we will see crop prices decline even further, and that will mean some economic tough times here for the ag sector across the the nation. Reporter that outcome could have devastating consequences. Its almost unimaginable. If you suddenly lose a fourth of your market, what do you do . Theres no other china on the planet where you can sell the surplus. No one can eat that much. Reporter now, one thing going in iowas favor, china buys u. S. Soybeans for a fraction of the cost of growing their own. And, jim, farmers here give trump a lot of credit for raising concern, but they say this is an economic relationship that has to continue. Axelrod jan crawford covering for us tonight in perry, iowa. In kentucky today, kim davis said she will return to work monday as the rowan county clerk. Davis spent five days in jail for refusing court orders to give marriage licenses to samesex couples. The judge released davis yesterday but ordered her not to interfere with gay couples applying for a license. Davis has not said whether she will comply, but one deputy clerk said he will issue licenses even if davis orders him not to. Investigators are trying to figure out why an engine on a British Airways jet caught fire as the plane was taking off from las vegas last night. The plane was bound for london with 157 passengers and 13 crew members. Captain, who was getting ready to retire next week, is being praised for avoiding disaster. Heres mireya villarreal. Reporter it took just seconds for flames and thick, black smoke to take over the left side of this British Airways boeing 777. One of the two engines caught fire. Responding fire crews say it was feet away from a massive fuel tank. I opened up the cover of my window, and just saw flames on the engine. Reporter the plane hit 100 miles an hour on the runway but pilots slammed on the brakes short of takeoff. The tower called for help at 4 13 p. M. , and two minutes later, firefighters were on scene. Passengers used inflatable slides to escape. Phil lowe helped people get out. People could see flames and people wanted to get off the plane. They were just terrified. Reporter howica oict was it. Yeah, it was bad. There was a lot of scream, shouting, get off, move. People started pushing, people pushing back. Reporter 27 people were taken to local hospitals with minor injuries. Aviation experts praisethe pilot and his team. Mark rosenker is the former chairman of the National Transportation safety board. Clearly, the pilots displayed tremendous professionalism by making the decision to abort this takeoff, many lives probably were saved. Reporter still no word yet on what caused the fire, but, jim, experts are saelg us right now they believe this will be a faster investigation because the planes engine is here at Mccarron International airport where it is easier to look at. Axelrod the greek coast guard said today it is investigating a report by our Holly Williams last night about an act of sabotage against migrants. 40 syrians set off from turk nea rubber dinghy, but a few miles short of greece, they were intercepted by an unmarked speed boat. Five men in plaque uniforms pointed guns at them and cult the fuel supply to the motor. It is not clear who did it. Greek Authorities Say its not consistent with the mission of their coast guard. The syrians were towed to safety by the Turkish Coast guard. The homeland they left behind has been torn apart by civil war, and isis is annihilating their Cultural Heritage. Whatever is not destroyed is being sold on a thriving black market, which cbs news infiltrated over the course of a sixmonth investigation. Heres Clarissa Ward. Reporter sacred monasteries destroyed, ancient temples leveled by explosives. But perhaps the greatest threat to syria and iraqs Cultural Heritage is what you dont see, the illegal trafficking of precious a antiquities. To get a firsthand look at this underground would, our producer posed as a buyer and made contact through social media with omar, a syrian living in turkey who offers looted syrian artifacts to international buyers. He claimed he had mosaics that were freshly dug out of the ground. These he could sell for 60,000, he wrote. We met in istanbul and recorded our meeting on hidden cameras. They were the ones who ripped it out. Reporter we asked archaeologist amr al azm to come us to authenticate the piece. Two nervous young syrians took us to a rundown apartment on the outskirts of town and showed us this. Beautiful a nearly 2,000yearold roman mosaic, and as we learned later, potentially worth 100,000. It was in syria. They recently brought it out. Reporter we were told they dug it out of the ancient city of apanea, one of syrias most significant archaeological sites, seen in Satellite Photos in 2011, now pok marked with the robber holes of looters. We moved to our van where the smugglers also offered us roman glass stolen from a tomb. The negotiating began. I need a rough price. I need a ballpark figure. 200,000 for the mosaic, they said, but that quickly dropped to 60,000. They were eager to get the illegal piece off their hands. Whats your reaction when you see a beautiful mosaic like this thats been looted from a precious site. Obviously sadness because these eventually will be bought by someone and theyll be lost to us forever. Reporter the main beneficiary is isis, which makes tens of millions of dollars on the thriving black market. The group issues permits to looters and takes a cut of the profits. For every antiquity they destroy on camera, thousands line their coffers through the illegal trade in antiquities. Reporter colonel Matthew Bogdanos led the investigation into the looting of the Iraq National museum in 2003. Now he prosecutes antiquity cases as an assistant district attorney. So who is buying these antiquities . Who is giving them the money . It is a cozy cabal of academics, art historians, dearlies, gallery owners, auction houses, museums and private collectors. Reporter so some of these antiquities are ending up here in the u. S. . Certainly absolutely. Reporter cbs news has learned that there are multiple ongoing investigations into isislooted antiquities that have ended up in the u. S. , but, jim, these cases are very difficult to prove simply because its so easy to forge documents about where these objects come from and how much theyre worth. Axelrod Clarissa Ward with more intrepid reporting. Thank you. In a case of mistaken identity, former tennis star james blake says he was handcuffd and thrown to the ground today by new york city detectives. Blake is in town for the u. 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The medicine in advil is the number one doctor recommendation for joint pain. Relief doesnt get any better than this. Advil axelrod anyone who has seen the voof a High School Football referee getting blindsided by two players last fridays had to wonder why did they do it. Accusations are flying as officials today began their investigation. Heres omar villafranca. Reporter the video of two san antonio, texas, John Jay Texas High School vicly tackling a referee has been viewed more than nine million times online. This is most egregious event i have witnessed in my 40 years of public education. Reporter Charles Breithaupt heads up the states governing body that oversees high school sports. This was intentional. It was on purpose, and it seemed to be premeditated. Reporter during the school board investigation, players claimed that after a few bad calls, assistant football coach matt breed said, this, guy needs to pay for cheating us. Breed is now on administrative leave. Several players also accused the umpire, robert watts, of using racial slurs during the game. Alan goldberger, watts attorney denies the claim and says both players should face justice in a court of law. Its a game. Its not appropriate to go assaulting somebody flownuously for whatever reason, particularly a bogus reason, a madeup reason that doesnt even exist twroarpt players have been kicked off the team, suspended from school, and could face criminal charges. Robert wattss Attorney Says the referee was injured but he is not in the hospital. Jim, the School Superintendent is treating this incident as an assault on a School Official but there is no timetable on if or when charges will be filed. Axelrod omar, thank you. In a moment, record heat and wildfires in the west. Diis critical for brain health . N brain food, hmmm. Ensure has b vitamins that help support brain health now thats smart nutrition. 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Unlike popes these days, queens dont retire at least not this one. I declare before you all that my whole life, whether it be long or short, shall be devoted to your service. Reporter its turned out to be long. Shes 89 now, the longest reign record, she says, was just a matter of time. Inevitably, a long life can pass by many milestones. My own is no exception. Reporter so many other public figures have come and gone. Very nice to see you again. Reporter shes met 11 of the last 12 u. S. President s, somehow missing out on l. B. J. And for a country that made rather a fuss about dumping this monarchy two and a half centuries ago, theres still a connection. She gave me a look that only a mother could give a child. laughter reporter it hasnt all been curtsies and bouquets. Six decades on the throne have produced a few down moments. The divorces of her children, the burning of her castle, the death of diana, and the bourque literally, to public pressure to pay respects to the popular princess. But thats all ancient history now. In 63 years, 216 days on the job, you learn a thing or two about how to do it. If the requirement is to be seen, wear bright clothes and a big hat, and try to look like youre enjoying yourself. Its the royal recipe for success smile and say nothing controversial. Royal historian David Starkey its as though by doing nothing, saying nothing, she said everything. Its astonishing. The monarchy no longer controversial. Reporter that may not be the case when the very opinionated Prince Charles comes to the throne. He, by the way, is now serving the longest internship in british history. But this was a day for the queen. They say she thinks the whole world smells of fresh paint because they spruce everything up for her visits. It seems theyre going to need a lot more paint. Mark phillips, cbs news, newtongrange, scotland. Axelrod and thats the cbs evening news for tonight. For scott pelley im jim axelrod in new york. And for all of us here at cbs news, thanks for joining us, and good night. Sandra bullock out with her new man. Details on her double date with jennifer aniston. Sandra was close to brian. He was very handy. Inside sandras night out. We have eyewitness details. They walked out arm and arm together. Our mission is to make a healthy environment for our kids. Jessica alba under fire again. Two class action lawsuits in one week. What shes saying today about claims her Honest Company lied. Plus, Vanessa Williams on her pageant return. Details on those nude photos. People feel that the pageant had done me wrong. What the reigning ms. America tells us today