Call for homeowners everywhere. Nightly news begins right now. From nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. Donald trump who has repeatedly decried negative Media Coverage of him, as part of a rigged system, has once again made himself the top of the news cycle for going where no president ial candidate has gone before. At aeral ne ohi mocking and then trying to qualify his jawdropping response from last nights debate, about whether he would accept the outcome of the election. His refusal to say managed to irk even some of his most ardent supporters, while shifting the focus from what many believe was his best debate performance. Nbcs katy tur leads off our coverage. Ladies and gentlemen, i want to make a major announcement. Reporter donald trump is refusing to play by the rules. Totally accept the results of this great and historic president ial election, if i win. Reporter making it clear the only outcome he will accept is the one that puts him in the white house. I would also reserve my right to contest or file a legal challenge in the case of a questionable result. Reporter a defiant do you make the same commitment that you will absolutely sir, that you will absolutely accept the result of this election . I will look at it at the time. Im not looking at anything now. Are you saying youre not prepared to stick to that principle . What im saying is, ill tell you at the time. Reporter trump reversing a vow he made just last month. Will you accept the outcome of the election . Reporter Trump Supporters all in, but condemnation. When you try to sew the seeds of doubt in peoples minds about the legitimacy of our elections, that undermines our democracy. I dont believe that theres a rigged election system. Reporter and the North Carolina gop, which said it was not aware Election Results were optional. What donald trump is doing right now is damaging that system, hopefully not beyond repair. Reporter the campaigns new spin, al gore did it too. But back in 2000, gore never questioned the process before the ballots were cast, and the recount was automatically triggered by state law, given how close the race was. Trumps campaign staking its candidacy on easily refuted claims, from the rigged election, trumps iraq war stance, and russian hacking. She has no idea. Its time for you to stake a stand. Whether its russia, china, or anybody else. Reporter today the Intelligence Community pushing back hard. Director of National Intense reasserting russia was behind the confident, you know, i think its speaks for itself. Reporter nbc news has learned from government sources trump was even briefed on russias involvement with the hack in his National Security briefings, three weeks after he openly asked putins government to find clintons missing emails. Russia, if youre listening, i hope youre able to find the 30,000 emails that are missing. Reporter less than 24 hours after that contentious debate, both donald trump and Hillary Clinton will be here, attending the alfred e. Smith charity dinner, where the only thing separating them will be a priest. Cardinal timothy dolan, seating right between them. All right, katy tur, thanks. A potentially tense and awkward affair certainly after what happened on that stage last night. At times, things got personal. Heated moments that included the kind of namecalling weve never quite heard in a president ial debate mitchell. Reporter it was downright brutal and personal. Shes been proven to be a liar. Rather have a puppet as president. No puppet, youre the puppet. Reporter fight night in vegas where the biggest impact white be on the krital female swing voters. Donald trump using graphic language to fire up conservatives, attacking Hillary Clinton on abortion. Based on what shes saying and based on where shes going and where shes been, you can take the baby and the womb in the ninth month, on the final day. And thats not acceptable. Reporter clinton relishing her first chance to go after trump about his female accusers, looking to get under his skin. Hes said he could not have possibly done those things to those women because they were not attractive enough i did not say that. For them to be assaulted. I did not say that. She mentions this, which is all fiction. All fictionalized, probably, possibly started by her and her very sleazy campaign. But i will tell you what isnt fictionalized, are her emails. Reporter then the moment the clinton team was hoping for. Such a nasty woman. Reporter how did you feel when he said, nasty woman, nasty woman, and youre a puppet. I justid reporter it quickly turned into a meme on twitter compared to a Janet Jackson song. Trump even taking a hit from the audience. Nobody has more respect for women than i do. Nobody has more respect please, everybody. Reporter late today, michelle obama, clintons best surrogate, going after trump too. Decent men do not demean women, and we shouldnt tolerate this behavior from anyone man, let alone prt. Theres nothing that i saw in his. Performance last night that leads me to believe hes going to do any better among women veerts than hes doing right now. Reporter with only 19 days left, the Clinton Campaign cannot hide its glee, because they believe theres not enough time for trump to bring those women voters back to his side. Turning now to nicole wallace, you are a veteran of tough campaigns. Breakthrough night last night. Did he harm himself, especially with women, though . Oh, just a little, lester. The poll numbers that were up at the end of andreas piece tell you everything you want to know, if you want to know whether a republican can win a national election. The last time it happened, was 2004. George w. Bush did that by narrowing that gender gap. He got the married women, he got the mom vote, something ive been tracking during the general election. And donald trump pushed them much further away. Account that we dont always hit the mark in terms of understanding what resonates beyond the belt way, but calling her a nasty woman, interrupting her the whole time, essentially morphing into the snl caricature of himself really sets in as a terrible image for donald trump among the kinds of voters he needs to sway. But think about the first 30 minutes of the debate. A much more subdued donald trump, and getting substantive issues, supreme court, very important to rs at that point, did you think he could turn this around . Well, it was his best performance. It was his best debate, but as he said last night, it was also her best debate. So shes almost in another league, in terms of her ability to communicate and now defend her own ideas. So i think she did a better idea. She has vulnerabilities too. These are the two most unpopular candidates weech seen on either side, as chuck todd keeps reminding us. He just didnt close the deal with anybody whos undecided at this point. Nicole, thank you very much. Turning now overseas where a u. S. Service member was killed in iraq today by a roadside bomb. The First American to die in the u. S. Backed offensive to drive isil out of mosul. Tonight our Richard Engel is on the front lines with iraqi forces and brings us an extraordinary look at the underground Tunnel Network isis used to prepare reporter iraqi and Kurdish Forces today launched their biggest push toward mosul. The main offensive was from the east and to the town of bartella, just over ten miles from the city. We climbed into one of the Iraqi Special forces old american humvees. Its battleworn, shot up, and the driver said damaged by an isis suicide bomber today. Then it was on foot. Rounds whizzed by. This predominantly Christian Village and one of isiss main defensive positions leading towards mosul, and theyre fighting hard to keep it. Isis sending out car bombs. But iraqi troops are advancing faster than u. S. Commanders anticipated. Well be in mosul in two days, a soldier boasted. But isis has had two years to prepare for this fight. The soldiers showed us a tunnel they had just found. Escape route. Also seems to be like one of their positions. Isis fighters lived here, safe from u. S. Warplanes. Just based on the number of mattresses weve seen, this could have held, 20, maybe 50 people, more if they packed them in. The tunnel extended for about a half a mile. At the far end, we came up into what appeared to have been an isis headquarters. Food still in the kitchen area. Halfmade bombs too. More. On the walls, isiss infamous logo. The sight of the black flag was once enough to send the iraqi army running. Thats how isis took mosul. Now its isis on the run. Tonight, iraqi forces have taken bartella, putting them within striking distance of mosul. Lester . Richard engel in iraq tonight, thank you. In arizona, this evening, police have released 911 calls connected to an unsolved serial killing spree still baffling investigators. After at least nine separate shootings, seven people, including a child, have been killed in the phoenix area. There have been thousands of new leads, but no arrests. We get the latest from nbcs miguel almaguer. Phoenix 911, where is your emergency . Um, hes shot on the floor. Yes, its my brother. Hes been shot. Reporter the heart breaking call for help from one family targeted by arizonas front of our house, i guess, and they shot him when he got out of the car. Im inside with my kids. I have two babies. Reporter afterseven people were killed, including a 12yearold girl, Phoenix Police now releasing chilling 911 calls, hoping to generate new leads in a case gone cold. Nancy pena, who lost her brother horatio, cant bear to listen to the calls. These families are having to rehear it, relive it. It reporter the killing spree began in march. Witnesses helped generate sketches but no arrests in this community on edge. He comes up at night. You get out of your car, he shoots you. Reporter a 75,000 reward and more than 3,000 tips, but the sketch, the only solid lead. When you see someone as prolific as this shooter, or these shooters have been, i think Law Enforcement knows its highly likely they could strike again. Case. They have the face of a killer. All right, how old is he . Hes only 21. Reporter and now the sound of the heartbreak hes left behind. Miguel almaguer, nbc news. There is late word this evening of another death connected to those exploding takata air bags. The national Highway Traffic Safety Administration says a 50yearold woman died from injuries in a crash on september 30th, while driving a honda civic that was first recalled in 2008. The repair never completed. The 11th confirmed u. S. Fatality tied to ruptures of takata air bag inflators. Still ahead tonight, every homeowners nightmare. The foundation of your house crumbling under your feet. Why its happening to so many homes and why its time to im terrible at golf. He is. But id like to keep being terrible at golf for as long as i can. New patented ensure enlive has hmb for the strength and energy to do what you love. New ensure enlive. Always be you. Our special today is the seared ahi tuna. Dont you hate that . When they dont tell you how much something costs and you have to ask . Maybe thats why i always make sure to. . Bring up the costs associated with your services. . I know. Transparency about costs. Consumer alert. In connecticut, as many as 30,000 homes are facing an issue so serious that the governor wants fema to declare it a natural disaster. And the effects could cost up to a billion dollars. Homeowners are watching their concrete basement walls crumble, putting their houses at risk of collapse in what could be a wakeup call for people everywhere, the Insurance Company say the problem isnt covered. Heres nbcs stephanie popping noises downstairs. And in the middle of the night. Reporter the noises were so strange they had no idea what was going on. Until vince went down to the basement. Oh, my god. And this has probably happened in the past year. Reporter the middle of the night sounds were the walls of the basement splitting. You can see outside. Reporter in some places, wide open. Are you worried at night the house is going to come down on top of i worry. I do worry. How do you sleep . Some nights its hard. Reporter their house was built 30 years ago, and theyre not alone. Theres something rotten in the foundations in northeastern connecticut. Engineer bill neil has told hundreds of families their homes are unsafe. Reporter do you have any sense the scale of this problem right now . My best guest is 10 to 15,000 houses. Traced back to one local quarry and the same concrete company, j. J. Moves. In a statement, they raise the possibility that the concrete was installed improperly by contractors, but experts say its a mineral in the quarry. After years of exposure to water and oxygen, it expands, causing the cracks. There is a fix. Lifting the home completely off the foundation and pouring n for the parokios who raised four children here, the price tag is more than 200,000. Nearly 60 the value of their home. So they turned to their Homeowners Insurance. The claim was denied. An industry spokesman said basic Homeowners Insurance doesnt cover the problem. The loss is occurring because of defective Construction Materials and or shoddy workmanship. No matter what state you go to, homeowners reporter theyre suing their Insurance Company. Meanwhile, their house continues to crumble. People say, why dont you just move out . Well, its my home. Reporter many of them face financial ruin and theres little hope of a quick solution. Stephanie gosk, nbc news, willington, connecticut. Were back in a mome . . I found a better deal on prescriptions. We found lower copays. New plan. Same doctor. Im happy. Its medicare open enrollment. Have you compared plans yet . Its easy at medicare. Gov. Or you can call 1800medicare. Medicare open enrollment. Youll never know unless you go. I did it. You can too. . . I am totally blind. I lost my sight in afghanistan. Calling 8448442424. Or visit my24info. Com. Our eyes they have a 200degree range of sight which is good for me hey and bad for the barkley twins. Take care of all your most important parts with centrum. Upgraded to our most d3 ever. . . Its not uncommon for autistic kids to flap their hands. Than party. My son max cant live in trump world. So im crossing party lines and voting for hillary. I dont always agree with her, but shes reasonable. And shes smart. She can work with people to solve problems. I want to be able to tell my kids that i did the right thing when it really mattered. Im Hillary Clinton and i approve this message. Look at all these purchases you made with your Airline Credit card. Hold on. You only got double miles let me show you Something Better. The capital one venture card. With venture, you earn unlimited double miles on every purchase. Not just. dismissively airline purchases. Every purchase. Everywhere. Every day. No really double miles on all of them were back with a warning for online shoppers. Apple says buying chargers and cables labelled as genuine apple products on amazon and found nearly 90 of counterfeit. Apple warns the knockoffs pose a significant risk of overheating, fire, and electrical shock. Mobile star did not respond to our request for a comment. Snoopy just got canned. Metlife is saying goodbye to the beloved character. The move comes as the company spins off most of its u. S. Insurance operations, instead focusing on corporate and international business, marking the end of an era for snoopy. Soon america will have to say byebye to baobao, the giant panda born in washington, d. C. Three years ago. Her parents were on loan from china and, shell be sent to china early next year. The atlanta zoo also announced its 3yearold giant panda i had frequent heartburn, but. My doctor recommended prilosec otc 7 years ago, 5 years ago, last week. Just 1 pill each morning. 24 hours and zero heartburn, its been the number 1 doctor recommended brand for 10 straight years, and its still recommended today. Use as directed i accept im not out on the ocean wrestling marlin. 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. But i wont go after anything with less than my best. So if i can go for Something Better than warfarin, ill do that too. Eliquis. Eliquis reduced the risk of stroke better than warfarin. Plus, it had significantly less major bleeding than warfarin. Eliquis had both. Thats what i wanted to know. Aking eliquis unless your doctor tells you to, as stopping increases your risk of having a stroke. Eliquis can cause serious and, in rare cases, fatal bleeding. Dont take eliquis if you have an artificial heart valve or abnormal bleeding. While taking eliquis, you may bruise more easily. And it may take longer than usual for any bleeding to stop. Seek immediate medical care for sudden signs of bleeding, like unusual bruising. Eliquis make increase your bleeding risk if you take certain medicines. Tell your doctor but im still going for my best. And for eliquis. Reduced risk of stroke, plus less major bleeding. Ask your doctor if switching to eliquis is right for you. Finally tonight, we have a remarkable story about the bond between a teenage girl and her little brother. A love that remains so strong even through tragedy and now theyve inspired a project that could help millions of other families. Heres gadi schwartz. . Id like to make myself . . Reporter at age 7, tanner long street helped put blush on his sisters cheeks. Tanner, dance we were so close. Reporter but at the age of 10, tanner was diagnosed with brain cancer and died the next year. I didnt do anything, was the words that came out of his mouth. Reporter tanner had a mutated gene, called tp53, that can lead to deadly cancer. When tested, the same gene showed up in his father and his sister. Chances of getting cancer . Numbers wise, its over 90 . I couldnt be more proud of someone who faces what she faces. Reporter now casey is the sole subject in a groundbreaking dna study theyve named th