Businesses that count on the cold. Nbc nightly news begins now. Le. Good eving. We begin tonight with the race for the white house, and the two frontrunners surging. Donald trump and Hillary Clinton almost looking past their own primary rivals and training their sights on each other. Clinton flexed her muscles during saturdays debate, insisting that Trump Country and this morning trump calling clinton a liar. All this as the first voters are just six weeks away from having their say. Has the very latest from New Hampshire. Reporter on defense, about a data breach by his own sanders taking a different tone today. Information came into our campaign about the clinton campaign. We didnt go out there . Or you had a yes, thats what the you believe it magically came in. Okay. Reporter his lawyerly language, coming a day after more direct words at the democratic debate. Not only do i apologize to secretary clinton, i want to apologize to my supporters. Reporter Hillary Clinton accepting that apology and issuing returning late from a commercial break. Sorry. Reporter her performance, largely looking past the rivals on stage with her to ones who might be next year, republicans like donald trump. We also need to make sure that the really discriminatory messages that trump is sending around the world dont fall on receptive ears. He is becoming isis best recruiter. Reporter trump firing back. She lies like crazy about everything. Whether its trips where she was being helicopter. Or an airplane. Shes a liar and reporter but trumps taking heat, too, for embracing praise from russian president vladimir putin, and defending him against accusations hes ordered journalists killed. Its never been proven that hes killed anybody, so, you know, youre supposed to be innocent until proven guilty. At least in our country. Reporter trump, off the campaign trail today, but others are making a preholiday push. Like Chris Christie on a bus tour in New Hampshire. Is it cramped quarters . Reporter no. Signing a photo for the pilot who flew president obama and him over new jersey sandy. What the American People should have learned that day about learn about me if they get a chance to make me the president , is that i will always put their interests ahead of politics. Always. And if you need proof of that, that pictures reporter christie hoping for a surge sometimes its better to be lucky than good. Already surging past another establishment competitor, jeb bush. Six months ago people thought you were the frontrunner. Your campaign is not you hated being the frontrunner . I feel much better back here. Reporter bush says he understands he has to earn the nomination. But that looks tough with trump solidly on top of rm every gop poll that seems to frustrate bush who did some selfdescribed therapy at an event here in New Hampshire this weekend. He unloaded on a frontrunner, kristen, calling trump a jerk. Hallie jackson, thank you for that report. Overseas now, a major scare in the air today. It happened on an air france jetliner with on board. A suspicious device discovered in a bathroom forced the boeing 777 to make an Emergency Landing in kenya. The story from nbcs reporter the packed air france boeing 777 from the Holiday Island of mauritius was supposed to land in paris. Instead, 473 passengers and crew were boarding buses in morning. The pilots made an after a passenger told in the bathroom. The plane was just went down, slowly, slowly, slowly. So we just realized probably something was wrong. A technical problem just not to make us scared. Reporter several other flights scheduled at the airport were diverted or canceled during the emergency. Within hours the ceo of air france announced the suspected explosive device was a false alarm. He said it was nothing more than cardboard, paper and a kitchen timer. Since the attacks in paris that killed 130 people in november, four air france flights have been diverted because of bomb threats. Airline flight crews are always on a very high state of alert. And i think what you would see is a similar response, regardless of the tragedies in paris, and in elsewhere around the world, the russian metro jet, so i think that they acted in accordance with their training and that long before the most recent terrorist events. Reporter most of the passengers were taken to hotels. To wait for flights out of kenya tonight. But a kenyan official said six are being detained for questioning. Including the man who reported the suspicious device. All could face criminal charges. Kelly cobiella, nbc news, london. Scary moments for those travelers. In this country now, the hunt goes on tonight for the texas teenager who killed four people while driving drunk, and received only probation after his lawyer claimed his familys affluence spoiled him and was a factor. We get the latest now from nbcs kerry sanders. Reporter tonight, the u. S. Marshals service says it believes someone must be helping fugitive ethan couch elude capture. If it is his mother, tanya couch, who also went missing nine days ago, it just got harder for her to hide, as well. Tonight, the Tarrant CountyDistrict Attorney officially listed tanya couch as a missing person, which means she will also now show up on databases. Hes getting help. We just got to find out how hes doing it. Would it be his mother . I think its a safe assumption. We have not yet located the mother. But, yeah, she could be helping him. Reporter the d. A. Says ethan couch may have fled because of this video. That appears to show couch with friends playing beer pong. If there was alcohol, that could be a violation of his probation. But its unclear, as the video does not show couch drinking. When somebody takes off, whos got a probation sentence, you have to wonder whether theres some concern about a violation that might put them back in jail. And as the former u. S. Attorney youve seen that happen . Weve seen many times where somebody got a generous term of probation, blew it by committing a crime, and getting put in prison for the whole time. Reporter ever since couchs controversial affluenza defense, an unexpected tenyear probation, there have been complaints of special treatment for the wealthy. Lucas mcconnell was injured in the drunk driving accident that killed four. Lucas father i think accountability for him, and would come in the form of swift and certain and severe punishment. Reporter judge jean boyd sentenced ethan couch and also set the conditions of his probation. We attempted to ask her about the developments today, but she was unavailable at home and didnt answer her phone. Tonight, the u. S. Marshal says even if ethan couch has fled the country, hes not beyond their reach. It really doesnt matter if he flees the country. Were going to find him and well make every effort to get that person back. Reporter tonight the u. S. Marshals say theyre confident that ethan couch will be behind bars and in jail soon, in part because they say even the wealthy eventually need to use a credit card, and a cell phone, and those, they say, are easily tracked. Kristen . Kerry, thank you. Three days after the arrest of a Young Drug Company executive on securities fraud charges, there is more effect, including at least two labs announcing theyll suspend a drug trial sponsored by his company. Nbcs Morgan Radford has more on the collateral damage. Reporter released thursday on 5 million bond, the pharmaceutical executive dubbed by some as the most hated man in america isnt staying quiet. Im not one for a lack of comments. Reporter Martin ShkreliLive Streaming for hours at a time. After pleading not guilty to securities fraud. Just yesterday, tweeting, im confident i will prevail. The allegations against me are baseless and without merit. While shkreli remains inside the comfort of his new york city apartment, the fallout over his alleged scheme keeps growing. At least two labs now suspending a Clinical Trial funded by his company for a leukemia drug. In a statement, a Cancer Center saying its stopping this Clinical Trial indefinitely pending the outcome of the investigation of shkreli. Returning a 15,000 check he personally sent them in january. Saying the more we learned where this money may have come from the more we felt like it was important to give it back. In september, shkreli made headlines for hiking up a cancer drug 5,000 . And doctors and patient groups saying they cant access this drug. Are you going to change the price . No. Reporter now, hes accused of orchestrating a ponzi scheme that stole millions. If convicted he faces 20 years. Today a rep for shkreli says his twitter account was hacked after a series of tweets including this one. Anyone want free money . Willing to donate hundreds of thousands to charities before i go to prison. Shkreli resigned from his company. Hes expected back in court in january. A tough pill to swallow. Morgan radford, nbc news, los angeles. Well, with just five days before christmas, many businesses find themselves scrambling to make up for slower sales this holiday season, due in large warm weather this fall. Nbcs ron mott tonight on the cold, harsh impact on the bottom line. Reporter winter is just a day away, and largely nowhere in sight. Last year this time we were all digging out of a lot of snow. Reporter boston may easily set a record for its warmest december on record. In d. C. I wanted to get a fun, wool hat and some cozy gloves and im like, well, i dont think thats going to work this year. Reporter complaints are few. Except from businesses that thrive on cold cash. An estimated 343 Million Dollars in lost sales compared to a year ago at the nations shopping malls. Weather this warm for this sustained a period it acts like a tide. Brings down all the stores and all the traffic into anything really thats apparel or apparel related. Reporter ski resorts like this one in the massachusetts berkshire mountains are among those worrying profits could melt away in the warmth. People say oh, gosh, i feel so badly for you guys were praying for snow. Pray for cold weather. Well take care of making the snow. Reporter this unusually balmy weather had toes on display in buffalo earlier this week. Something else youll see around town. People are wearing flipflops, like me. Reporter ski gear sitting on shelves in minnesota. Were not seeing customers come in for the winter specific stuff. Reporter even keeping vermont bears from their beauty rest, hibernation. And whod imagine a round of golf on long island in late december . They had a Global Warming open here last weekend when it hit almost 70. Not as mild today. About in the mid 40s. But still warm enough to putt, chip or free. Mike meehan said some golfers are breaking out the short sleeves. Last year the first couple weeks of december on the weekends we had about 51 players. This year weve had 397. Reporter so whether it will ever get cold or snowy enough this winter for that coat youve been eyeing remains to be seen. Buy it anyway. Its probably on sale. Old westbury, long island. After a chilly weekend that weather in the eastern part of the country is right through this holiday week. We get more now from nbc news meteorologist dylan dreyer. Kristen. It was much colder half of the country over the weekend. But we are going to notice the jet stream start to lift off to the north and we are going to get back into that warm stretch of temperatures. Most likely breaking some records across the eastern half of the country closer to christmas. Out west well still stay about that cold and stormy pattern with the mountain snow and the rain along the coast. But on Christmas Eve day, look at these potentially recordbreaking temperatures. New york city, 72 degrees. Thats 30 degrees above average for this time of year. Washington, d. C. , mid 70s. Even cleveland and buffalo, running more than 20 degrees above average with highs topping out in the upper 50s. On Christmas Day across the northeast its going to cool off a bit but still run about 10 to 20 degrees new york still hitting 60. Washington should still hit 62. Cleveland about 51. And this warmth will obviously extend down south as well from dallas, new orleans, even tallahassee. Temperatures in the 70s in florida, hitting 80 degrees. And then on Christmas Day again, slightly cooler for some in the northeast. But down south it gets even warmer. Tallahassee running about 20 degrees above average. We should eventually get into a more typical pattern as we get closer to new years. Kristen . Dylan, thank you. As he does almost every sunday, former president jimmy carter spoke at his church in georgia this morning. Two weeks ago youll recall he announced that he was cancer free. But today carter delivered some sad news. His 28yearold grandson jeremy had died just hours before after falling ill at his familys home. And they dont know how long he stopped eating. And they took him to the hospital and we got there i guess morning. And i believe i was there for about three minutes, it heart stopped beating again. So they decided to give him cpr but he passed away. Carter went on to say that the congregation should be filled with a sense of joy and thanksgiving, even in sorrow. Important lesson for everyone there. Well, when nightly news continues on this sunday, new hope for treating pregnant Technology Empowers us to achieve more. It pushes us to go further. 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And tonight we want to tell you about an enkourageing study that looked at treating cancer in women who are pregnant. Nbcs rehema ellis has the details. Reporter just as mary harris and mark ladove were hoping to add another child to their happy family, they got devastating news. Mary was diagnosed with breast cancer. You know you just wept. Reporter and then they learned she was pregnant. What were your options at that point . We had every option in the book. We could terminate. We had doctors tell us that that would be their recommendation. Reporter or face harsh cancer treatments, surgery, radiation, chemotherapy. It took us a long time to wrap our heads around the idea that a drug designed to kill off all the quickgrowing cells in your body is safe to use while you have a baby developing. Reporter desperate to save marys life, and the babys, they chose surgery and third trimester. A decision supported by a new, small but encouraging study. Finding no signs of harm to the babys after powerful chemotherapy. If you wait until the second and third trimester when the organs are developed, the birth defect rate goes down to what we see in the general population. Reporter the miracle of medicine, seen in a healthy baby stella. When she was born and you see your baby, youre thinking . It was amazing. She just had this mop of black hair. And this beg set of lungs. She was a fighter. Be here. Reporter now mary shares her story and others through her new york public radio podcast called only human. So that other families will learn from her agonizing choice, there is new hope for pregnant women with cancer. Rehema ellis, nbc news, new york. When we come back, sweater weather. And why it was one for the record books. I accept im not 22. I accept im not the rower i used to be. P i even accept i have a higher risk of stroke due to afib, a type of irregular heartbeat not caused by a heart valve problem. 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