First the nightline 5. Do you suffer from constipation or irregularity . Trust kulcolax. Try it free. Dulcolax tablets are comfort coated for gentle coated relief. Designed for debeadable relief. I take prilosec for frequent heartburn heartburn. Because you cant beat zero heartburn. Prilosec i good evening. We begin tonight with donald trump in the lions den. Surrounded by ampedup rivals at tonights big republican debate. Heading into the event, trump was actually talking about toning it down a bit. So did that happen . Not quite. I wrote the art of the deal. I say not in a braggadocious way. Reporter after an uncharacteristic attempt at modesty in his Opening Statement it took just minutes for donald trump to start engaging in his trademark verbal trench warfare. First of all, rand paul shouldnt even be on this stage. Hes number 11. Hes got 1 in the polls. His visceral response to attack people on their appearance, short, tall, fat, ugly. My goodness. That happened in junior high. Reporter battling began with kentucky senator rand paul and then Wisconsin Governor Scott Walker leapt in. Mr. Trump, we dont need an apprentice in the white house. We dont need an apprentice in the white house, we have one right now. Reporter all this hours after this interview trump gave to the Christian Broadcasting Network in which he said this. I think i could tone it down when somebody hits you, you can hit a little less hard. I think i could tone it down a little bit and ill try. Reporter tonight, tauping it down was not to be. Especially when it came to the former frontrunner and frequent trump target, jeb bush. I think hes a very lowenergy person and i dont think thats what the country needs. I didnt want excuse me one second. No. The simple fact is, donald more energy tonight, i like that. I think he woke up in moments. I think his finest moment was when he turned to trump and said, you should apologize to my wife. To subject my wife into the middle of a raucous political conversation was completely inappropriate. I hope you apologize for that, donald. No i wont do that, because i said nothing wrong. I do hear shes a lovely woman. I thofs thats his finest moment. I think he did better than his last debate. I dont know if its enough to get his trajectory back in a positive direction. Reporter the clash that this evening will perhaps be best remembered for came with Carly Fiorina, the only woman on the stage. A woman about whom donald trump recently told Rolling Stone magazine, look at that face, would anyone vote for that . We are the majority of the nation. Reporter in response to which fiorina has been running these ads. This is the face of a 61yearold woman. I am proud of every year and every wrinkle. Mr. Trump later said he was talking about your persona, not your appearance. I think women all over this country heard very clearly what mr. Trump said. [ cheers and applause ] i think shes got a beautiful face and i think shes a beautiful woman. All right on that note reporter trump and fiorina, the former ceo of hewlettpackard, also went at it records. The company is a disaster. And continues to be a disaster. They still havent recovered. Companies. That i can tell you. Mr. Trump, i find it quite rich that you would talk about this, you ran up mountains of debt as well as losses using other peoples money and you were forced to file for bankruptcy not once i never filed for bankruptcy. Not twice, four times. A record four times. Why should we trust you to manage the finances of this nation i tell you any differently than you manage the finances of your casinos . Carly reporter fiorina wasnt included in the main debate last time on fox news. Tonight she made the most of her air time weighing in on everything from putin to planned parenthood. As regards planned parenthood, anyone who has watched this videotape, i dare Hillary Clinton, barack obama, to watch these tapes. Watch a fully formed fetus on the table. Its heart beating. Its legs kicking. While someone says, we have to keep it alive to harvest its brain. This is about the character of our nation. And if we will not stand up and force president obama to veto i thought Carly Fiorina was the clear winner tonight. I thought her answers were crisp, her answers were clear. She took on everything in her record, foreign policy. I thought she was by far the standout tonight. Reporter that notion bolstered by fresh stats out of twitter. The company telling us the two mosttweeted moments of the night were fiorina responding to trump about her looks, and talking about planned parenthood. The question the next few days will be, will fiorinas performance tonight change her standing in the polls . As of yesterday in a national poll, she was at 4 . Trump was out front at 27 . Followed by dr. Ben carson. A pediatric neurosurgeon whos been on the rise of late. Tonight, however, dr. Carson was not heard from that much. I think he kind of disappeared. I dont think he hurt himself. He definitely didnt help himself like he did in the last debate. Its probably a wash for him tonight. Reporter with so many candidates vying to distinguish themselves, tonight was a theyve all been preparing for days honing their lines behind the scenes. And then in the hours leading up to the event, prepping in their own ways, rand paul firing guns. Were all in and im ready for combat. Reporter jeb bush attending church with his wife. Rayed to my creator to be strong. Reporter it wasnt all republican on republican brawling on stage tonight. There was plenty of Hillary Clinton bashing as well. She does not have a track record of accomplishment. She believes in the systematic of children in the womb. This administration with president obama and Hillary Clinton has created insecurity the likes of which we never would have imagined. Reporter she weighed in on twitter in response to trumps comments about fiorinas appearance. I think shes got a beautiful face and i think shes a beautiful woman. Reporter clinton tweeting, realdonaldtrump should stop complimenting women by far the most question coming out of tonight will be, did the early analysis were hearing at this hour is not good for him. I think donald trump probably is going to drop in the aftermath of this poll, mainly because of his mannerisms and facial expressions and how he treated the other people on stage. I think this performance would have been fine the first debate, but now that time has gone by, i think people are expecting more. I think he hurt himself in the course of this debate. If you cant get enough of this republican road show, fear not, the next debate is coming up in a mere six weeks. Up next here on nightline, the new front in the war on isis, the risky race to save priceless artifacts. As the terror group mounts a campaign of destruction. Plus some of bill cosbys accusers now coming out and sharing their stories publicly. Ece 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 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. Even if you have already been vaccinated with another pneumonia vaccine, prevnar 13 may help provide additional protection. Prevnar 13 is used in adults 50 and older to help prevent infections from 13 strains of the bacteria that cause pneumococcal pneumonia. 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Reporter once known as the pearl of the east, damascus is one of the oldest continuously inhabited cities in the world. Reporter weve just come through what was actually rather Light Security by the entrance to the old city. And today as life goes on here, for a moment you can forget that this is a country at war of more than four years. In the past few minutes, two large booms in the distance. The fighting raging all around this city. Just 15, 20 minutes away. War in syria has already claimed 250,000 lives. Millions more forced to flee their homes. Now its also a race against from syria forever. Isis spawned from the conflict in this region. Theyve made it their mission to destroy anyone or anything that stands against their extremist ideology. Isis proudly documenting their heartbreaking acts of destruction throughout the region. The ancient city of palmyra is their latest target. One of the most important archeological sites in the world. Criminal gangs taking advantage of the chaos, working with isis to loot these sites. Isis sees this Cultural Heritage as exmightable resource. Isis loots what it can sell. Isis will then destroy, for propaganda pumpsrposes, what it cannot sell. Reporter satellite imagery shows such sites covered in holes dug by looters, the fighting and extremism. Reporter weve come to damascus to see whats being done to rescue syrias heritage. Because damascus is the most secure city in the country all the artifacts that are at risk are brought here to the national museum. Were on the way to meet the team whose job it is to rescue those treasures. The national mu seep has been closed to the public, eerily quiet. You see this case and all the other case ss emptied out. Reporter there is corner of the museum where the work is in overdrive. For these young archaeologists this is their front line against isis. How valuable are these pieces in syrian archaeology . Precisely. Reporter this is from 3,000 b. C. . Yes. Reporter these are some of the 300,000 objects saved from all over the country. This is a hive of activity, the last step, pack delicately into these chests to be taken to topsecret locations were told are known only to a handful of people in syria. All the artifacts were seeing are from the eastern part of the country. This area has some of syrias most important archeological sites and everything here was pulled out as isis was advancing. The team fired on by militants last year as they frantically loaded the artifacts onto trucks. For the biggest items that cant be moved, cement boxes are being built around them. The work these archaeologists do often puts their very lives at stake. Just last month, professor al assad was publicly beheaded by isis for refusing to swear allegiance and not revealing hidden artifacts. Important reporter the man leading this mission, dr. Be a bule kareemka abdul kareem. The strategy to hide objects. Because we dont know when the cites sister will finish. Reporter while touring a third century reconstructed synagogue, abdul kareem tells us his mission is not political, despite working for the assad regime. Your message is, were trying to protect the worlds heritage . Exactly. Its not just syrian heritage. Its your heritage. You cannot disappear all civilization, jewish, christian, muslim. We have one humanity, civilization for all the people. Its our duty to preserve this together. Reporter sharing in that duty, even those who oppose the assad regime. Both sides of the divide, they go out there and risk their lives. This link is going to be what we need once this conflict is over. Reporter from ohio, professor amaer al azzam helps oversee a team of monuments men, volunteers working on the other side of the front lines, even undercover in isisheld territory. But 92 matter how hard they work to protect and track these items the global trade in looted antiquities is booming, fueled by demand from buyers abroad, as far away as london. Everyone here is probably going to be affluent and purchasing expensive things reporter professor mark altawil is an expert in what he calls blood antiquities. The scale is massive. Its certainly funding a lot of armed groups or armed groups in the conflict. That to me is the great tragedy of this. Its leading to the utilization of the past to destroy the present. What prices are we talking about . Large mosaics can sell for hundreds of thousands of dollars. Certainly these objects have tremendous value. Reporter he says most of the illegal trade occurs online. It says syrian. And other objects could be from syria. Reporter though not all items can be traced to looting, he wants the sale of all antiquities out of syria to be stopped. People are not seeing the connections, that antiquities are now funding vie length. Violence. That is a huge game change arer thats affecting peoples lives. Will you be taking this out . Yeah. Reporter in ka damascus the professor claims the vast majority of syrias artifacts are safe for now. But every day he receives more reports of more pillaging and more destruction. Antiquities director in the whole world. We are tired. But we need to be more strong. We need to have some hope. To continue our work. Reporter im Alex Marquardt in damascus. Our thanks to Alex Marquardt tonight. We want to tell you, you can immerse yourself in the streets of damascus with an exciting new visual 3d experience we launched today. Check out abcnews. Com vr. Next on nightline, with bill cosby facing allegations of abuse stanning five decades, tonight. Think your heartburn pill works fast . Take the zantac it challenge zantac works in as little as 30 minutes. Nexium can take 24 hours. 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Bill cosby was a titan. He had so much power. I was just a smalltown girl. I had just turned 20. I was 23 years oelld. I wasnt going to go up against goliath. The kind of perpendicular i was dealing with would destroy me. He told me he better never see my face or hear my name again. From that day forward i never said anything else. This is a template for the almostperfect crime. Were going to rectify it for him. We have a right to speak our voice