Ahead of saturdays South Carolina primary where trump still leads. Nbcs Hallie Jackson has late details. Reporter tonight a stunning shift in the republican race, a new national frontrunner, ted cruz. Its tremendously encouraging to be leading the field nationally. I think as a result reporter did you ever think youd be here . That was always the plan. Look, thats how you win. Got to get to first place to win. Reporter its a 15point flip from last month, trump slipping seven points and cruz up eight. After the iowa caucuses, the New Hampshire primary and saturday nights debate. Republican voters have taken a pause deciding whether or not they want to nominate donald trump to be president. Reporter as cruz heats up, hes burning it down in South Carolina with a scorched earth news conference. File a lawsuit. Reporter daring donald trump to sue him over this ad. Well, im very pro choice. Reporter trump wants cruz to stop airing the spot pointing to Trump Supporters have shown a great likelihood of forgiving him for positions like that. Reporter cruz insists hell put the ad on tv more often now, even as trump doubled down on his threat in an msnbc town hall. Ive had Great Success in business. Ive had Great Success with lawsuits, and i dont know that were going to have a lawsuit but we certainly want to keep somebody honest. Reporter taunting cruz, saying time will tell, teddy. Trump is again calling him a liar, their political bromance dead. You hugged him for months and months and months and those who say you and your support of donald trump at that time has allowed him to be where he is today and to be in the position to talk about this stuff. At a time. Theres a time and season for campaign for policy differentiations snow hauls knew this moment was coming . Of course it was headed to this. Reporter in South Carolina its trump who is still dominating in the polls. Cruz, trailing him, marco rubio close behind and closing in. Late tonight pick up a new carolinas popular governor. Thank you. Reporter rubio wasnt the only one looking for nikki haleys support. Jeb bush was, too, but our new polls hypothetical headtohead matchups show bush and john kasich would lose to donald trump. Only cruz and rubio would beat him. Lester . Hallie jackson, thank you. Im joined now by chuck todd, our political director and moderator of meet the press. Chuck, theres been broad consensus if trump wins South Carolina he would have a clear path to the nomination. Do these new National Poll numbers suggest things wont be that easy . Reporter i think what you see here with our new numbers is this, lester. Is that weve always told you and weve been polling this for months. Donald trump has a low ceiling but a high floor meaning hes never going to drop too low, but he always seems to struggle as the field shrinks to get over that 50 mark, and what our polls show on this is that as this field has shrunk, the smallest need weve tested in trump doesnt grow, everybody else does, so this is a flashing yellow light for donald trump, even if he wins South Carolina. Hes going to have problems down the road as the field winnows. Chuck todd tonight, thank you. Much more from donald trump at a town hall event tonight at 8 00 eastern and pacific only on msnbc. Things are rapidly changing in the democratic race, too, where Hillary Clintons once Comfortable Lead in nevada has all but evaporated, now a virtual dead heat with Bernie Sanders ahead of saturdays vote and now with what looks like a long road ahead of them to the nomination sanders and clinton are increasingly focused on securing the black vote. Nbcs Kristen Welker has more. There is something wrong, my friend. Reporter secretary clinton is ramping up her outreach to black voters on the south side of chicago today, vowing to reform the criminal justice system. To make sure that no other young woman like sandra bland is ever pulled out of a car for no jail where she is found dead. Reporter Sandra Blands mother by her side less than a year after her daughter was found dead in a texas jail, this as a new poll shows clinton and sanders now deadlocked in nevada, her doubledigit lead in october evaporating to a single point. Reporter senator sanders, who is struggling to win over minorities, making his case at a rally in atlanta last night, but the headlines came from sanders surrogate, rapper killer mike quoting educator and activist jane elliott. Jane said michael, a uterus doesnt qualify you to be president of the united states. Reporter those comments the accusations of privacy advocates say they will help build the order. If we build a back door or master key into the lock you cant control that only good guys are going to use it and bad guys cant use it. Reporter after months of saying it cannot get into a locked phone apple now says it should not be forced to do so. In a letter to customers ceo tim cook says if apple creates the software and it fell into the iphone, a blow to customers who rely on Companies Like apple to protect their data. They do business all over the world, and if they give this kind of access to the u. S. Government, they may have to give it to the russians. They may have to give it to the chinese, and apple simply doesnt want to do that. Reporter this proifsy versus security showdown comes against the backdrop of an act of terrorism. The husband of one of those killed in the San Bernardino shootings says apple is wrong. Im very upset at apple not assisting the federal government. Peoples lives matter. Reporter new york citys commissioner agrees. The right to privacy is not a total right in the sense that if its being used for criminal purposes. Reporter before the San Bernardino shootings the majority in an nbc news poll said they were worried the government would go too far in terrorist investigations and violate the privacy of citizens. After the attack the majority worried the government would not go far enough. Apple says it will fight this lester . All right, pete, thank you. Overseas dozens are dead and injured after a bomb exploded near turkeys parliament, a horrific attack in the heart of a strategic u. S. Ally. The question tonight who did it . Nbcs Kelly Cobiella reports. Reporter a fireball in the heart turkeys capital at height of rush hour. Flames shot several feet into the air as people scrambled to safety. Police and the military sealed off the area while emergency workers rushed in to help the injured. The target was the turkish military. The powerful car bomb exploding just as buses carrying officers and soldiers drove by the armed forces headquarters, stopping at traffic lights. More than two dozen are dead and some 60 injured. The countrys deputy Prime Minister called it a wellplanned act of terrorism, the latest in a string of ten German Tourists killed in a suicide bombing in istanbul. More than 100 killed in a double bombing at a peace rally in ankara. Isis blamed for both attacks. Turkey is fighting the terror group in syria and iraq, but its also at wore with kurdish militias. Turkey now is in the eye of the storm. It faces a strategic predicament. It faces multiple insurgencies. Reporter turkeys president said tonight hes determined to fight those who carried out the deadly bombing. Kelly cobiella, nbc news, london. Pope francis is wrapping up his trip to mexico with an historic crossborder mass. The event, a few hundred feet from the u. S. Border attracting tens of thousand of followers on both sides. As nbcs Anne Thompson explains the pope is seizing this moment to make an emotional plea on the issue of immigration. Reporter a simple gesture and powerful message. At the u. S. Border fence pope from mexico on immigration. Francis himself the son of immigrants seeking to put a human face on the people fleeing what he calls grave injustices, poverty, exploitation and violence. Among the hundreds of thousands here to see him, 21yearold Jasmine Flores who crosses the border every day to go to school. For him just to cam to juarez, means everything to us. Reporter no longer the murder capital of the world juarez is still a dangerous place. Father half jer kovalio runs a shelter for immigrants. He says he hopes francis can make americans see the people he helps every day should be treated with dignity. As he does on nearly every foreign trip, francis visited a prison. One of the inmate musicians overwhelmed. This evenings mass broadcast on both sides of the border. Reporter the joy on the popes face marred only by a brief flafsh anger when an overzealous fan almost pulled him down on to a person in a wheelchair. Dont be selfish, he said. The vatican says mass here on the border is not a political statement but a moral one by a pastor trying to unite a divided world. Lester. Anne thompson tonight in mexico can, thanks. Its being called a landmark study that could affect millions of men who suffered from low testosterone. Lowt as ads call it have been linked to everything from plos of energy, muscle mass and sexual function to increased vulnerability to illness and now as nbcs tom costello tells us new Research Sponsored by the National Institute of health toys testosterone replacement therapy may have benefits. I figured low testosterone would decrease my sex drive. Reporter a 5 bill yo a year millions of men are on testosterone replacement sharpe hoping to boost their energy, sexual desire and function. Among them 62yearold ed stevens who said at the age of 55 he suddenly began to feel tired and depressed. I just felt off and at the gym i started losing ground. Reporter diagnosed with lowt he began testosterone replacement therapy. My body mass came back to where it was. My energy was better, libido was a little better. Reporter now for the first time a National Study has found that a testosterone replacement gel provided some benefits to men 65 and older who suffered from lowt. Its toast ron treatment improved their sexual function, their mood, and depressive symptoms and perhaps also improved walking. Reporter researchers insist its too early to say whether all men with lowt should be on previous studies have found boosting testosterone might lead to increased risk of heart attacks and Prostate Cancer but millions of man say testosterone has improved their quality of life. In texas 68yearold dr. Bill riley says testosterone sharpe has changed his life. There were risked of taking testosterone but the benefits far outweighed any risk. Reporter hes such a believer hes now the medical director for a chain of lowt clinics as the baby boomer generation looks to offset the effects of aging. Finish strong. Reporter tom costello, nbc news, washington. Still ahead tonight, know what youre eating. The package may say Parmesan Cheese, but you may be surprised to find what else could actually be in it. Some of it may not even be cheese. Also, another piece of the mystery solved over who will split the during its first year, a humpback calf and its mother are almost inseparable. She lifts her calf to its first breath of air, then protects one of the most important things you can do is help the next generation. At pacific life, we offer Financial Solutions to accomplish just that. Ask a Financial Advisor about pacific life. The power to help you succeed. Whatcha doin . Just prepping for my boss party in a couple weeks. What are those . 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Dont stop eliquis unless your doctor tells you to. Eliquis can cause serious and in rare cases fatal bleeding. Dont take eliquis if you have an artificial heart valve or abnormal bleeding. If you had a spinal injection while on eliquis call your doctor right away if you have tingling, numbness, or muscle weakness. While taking eliquis, you may bruise more easily. And it may take longer than usual for bleeding to stop. Seek immediate medical care for sudden signs of bleeding, like unusual bruising. Eliquis may increase your bleeding risk if you take certain medicines. Tell your doctor about all planned medical or dental procedures. Eliquis treats dvt pe blood clots. Plus had less major bleeding. Both made switching to eliquis right for me. For many of us a plate of pasta wouldnt be the same without a sprinkle of Parmesan Cheese, but when the fda investigated, it found one companys supposedly 100 Parmesan Cheese actually contains substitutes, including a filler that can be derived from wood pulp. So how do you know what youre really buying and eating . Nbcs Olivia Sterns has more. Reporter its no secret that americans love their cheese. Just ask seinfelds george costanza. I want to bite into a big hunk of cheese, bite into it like its an apple. Reporter an fda investigation raising the youre eating . In 2013 the agency targeted castle cheese saying what the company labeled as 100 Parmesan Cheese was actually a blend of cheaper cheeses and cellulose, an organic filler which can be derived from wood pulp blasting a company in a letter saying, quote, your Parmesan Cheese products do not contain any Parmesan Cheese. The company took corrective action but ended up filing for bankruptcy and could not be reached for comment. The fda allows up to 4 filler product like cellulose in cheese, but experts say its whats in the other 96 that might not be exactly what you think. Experts say some companies go too far. They are trying to do things that we dont notice but to cut corners so that they can make money. Reporter Food Fraud Initiative tracks cases of mislabeling citing some involving certain brands of cheese, extra Virgin Olive Oil top chefs like nbc contributor Tom Colicchio say they dont have being marketed as fresh and local and it isnt at all. Reporter a possible contributing factor, former fda commissioner dr. David kesler says the fda folk yisz on ensuring food safety, not investigating truth in advertising. We cant forget that there are people, that are companies who cheat the system. Reporter that may be grating news to fans of 100 real Parmesan Cheese. Olivia sterns, nbc news, new york. Were back in a moment with a new leader of the pack from this good news. Youre down with crestor. 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Reporter david and maureen are splitting the record 1. 6 billion jackpot with two other winners, one in california who has yet to come forward and john and Lisa Robinson from tennessee. Can we see that ticket. Reporter who appeared on today just two days after the drawing. Unlike the Robinsons Dave and maureen took some time to claim their prize. Still, they were anxious about this day. Dreading it. Reporter couple told lottery officials when they arrived here today they would be taking the thats 327 million plus change before taxes. In their home town of melbourne beach, florida, the mystery is finally over. We had no idea. They acted normal reporter couple say they will take care of family, donate to charity and david may buy a car. Otherwise no big splurges planned. I want to get a massage. Reporter Janet Shamlian, nbc news, tallahassee, florida. That will do it for us on a wednesday allegedly videotaped a woman in the shower may not have been a complete stranger to the university dorm. Plus people who drive through the streets of the cedar valley are breathing a sigh of relief as crews take advantage of the warm weather to get a jumpstart on pot holes. And iowa drivers listen up the way you pass cyclists on the youre watching kwwl, weve news at six. Good evening everyone, im ron steele. And im amanda goodman. Thanks for joining us. The man who allegedly videotaped a woman showering at the university of iowa may have been familiar with the dorm building. Police arrested Robert Hightower of iowa city. Hes accused of peeping on women in the shower at burge hall. Students say it worries them how easily he was able to enter the nats a peeping tom . Its something students like alexis wynn never thought theyd have to worry about. sot it creeped me out. Robert hightower burge hall around 9 00 monday night. But wynn says this isnt his first time on campus. Turned around the corner at the students think he made his plan the night before. sot he was Walking Around in our hallway and other wings of our hallway, and saying that he lost his wallet, which he inside the door becuase the censors were on at the time. sot. Cg Hillary Maglin the afternoon. Students need their school ids to access the building, meaning someone likely held the door for hightower, thinking he was a student. Students tell me its something that happens all too often. sot. Cg gabby duncan student its something that everybody does. I mean, you kind of just hold the door open for people. You know, it seems like common courtesy. The school has since changed the locks on the womens restroom doors, but some students do worry now it may not be enough. Know, anyone could come into the dorm, and i really hope that wouldnt happen where i live on maglin. Kwwl news. Students say hall coordinators have