Hoverboards over fears of fire. Tonight, the concern that has some parents saying, no way good evening. Thanks for joining us on this sunday. Im tom llamas. We begin with a major shift in the race for the white house. A republican challenger coming on strong. Two polls show that ted cruz is now the man to beat in iowa. Ten points up in a new poll, rising more than 20 points, a recordbreaking surge. The iowa caucus is now just 50 days away. The republicans are set to face off in a highstakes debate on tuesday, and trump already trying to take down cruz. Mary bruce is at the white house tonight. Reporter tonight, senator ted cruz is cruising, passing donald trump in iowa. Its a meteoric rise for the texas senator, a 21point gain since october in one poll. Friendly rivals, but trump is now taking aim. When you look at the way hes goes in there like a you know, frankly, like a little bit hell never get anything done. Thats the problem with ted. Reporter cruz responding, tweeting this clip from the movie flashdance. And saying, in honor of goodhearted maniacs everywhere. This after cruz questioned trumps ability to be commanderinchief. Its a question of judgment. I would say i have far better judgment than ted, and i think i have a really great temperament. Reporter and trump has a new message for any gop party leader conspiring against him. Im sorry i did this to you, but youve got to get used to it. Its one of those little problems in life. Reporter trump maintains strong support in iowa even as he denounces the polling. The Des Moines Register is the worst. They are the worst. Reporter but as cruz rises, ben carson is falling. Poll numbers go up and down. I wasnt i wasnt excited when they were up. Im not excited when they were you know, this is a very fluid contest. Reporter and it looks like they may have a new candidate to contend with. Ive made a big decision, im entering the race for president of the United States of america. Reporter saturday night live bringing back will ferrell as president george w. Bush. The field of republicans out there is so messed up, i figure it makes you feel like you miss me, doesnt it . Reporter cruz is rising just as republicans get to ready to on tuesday. Where trump will be center stage. But for the first time, cruz will be standing right next to tom . Mary, thank you. And the democrats will debate this week as well. Join david muir and martha democratic debate, saturday, december 19th, 8 00 p. M. , 7 00 and new questions about the terrorist attack in San Bernardino and whether it might have been stopped. Also tonight, inside the chase and the shootout with the Police Officer right behind the killers black suv. Well hear from him. Heres kayna whitworth. Reporter tonight, dredged out of this lake after still no word whether theyve found any traces of that missing hard drive belonging to syed farook and Tashfeen Malik. Prove critical for investigators amid new questions about the screening that allowed malik into the country in the first place. Had they checked out Tashfeen Malik a little more, maybe she wouldnt have gotten a visa. Maybe those people in San Bernardino would be alive. Reporter malik vetted by homeland security, the state department, and had a criminal background check. Scrub social media. After the attack they found maliks Facebook Post critical of moderate muslims. Now the New York Times reports media in support of violent jihad and wanted to be a part of it. Im asking to immediately initiate a program that would check the social media sites of those admitted on visas to see if they are using words like jihad, explosives, mass shootings. Its outrageous that this isnt already done. Reporter tonight, one of the officers who chased the killer couple down is speaking out. Sergeant andy capp. They havent stopped. And the back window of their suv shatters. And i see gunfire coming out of it. Reporter the black suv pulls over. Farook gets out and starts firing. Capps gets out to return fire. I saw him shooting at a deputy. That i know was across the street. Thats when i opened fire on him. Reporter the terrorists were killed in that shootout. The first time in his 23 years on the force that he ever fired kayna, thank you. Next, to the extreme weather tonight. More than 100 Million People feeling it this weekend, the worst of it in texas. Take one look. One of three confirmed tornadoes destroying this neighborhood. High winds knocking this train off its tracks. Heavy rains triggering flash flooding, too. Kendis gibson in east texas tonight. Reporter tonight, a view from the air of devastation across the state of texas. Wow. I think thats a tornado. Reporter in willis, a tornado destroying roofs, uprooting trees, toppling vehicles. Tornado just hit. Reporter tiny lindale, described as a disaster area by its first responders. A tornado damaging up to 50 homes. We are striving to keep unnecessary people out and have only the people that need access into this area. Reporter the twister coming within feet of Luke Griffins home. Where did it go . It just started back that way towards the high school and you can see up there on that lane it was just a white wall of stuff flying everywhere. Reporter jennifer skender, out Christmas Shopping when the tornado ripped apart her home of 11 years. A neighbor texting her these photos of her house. Im just thankful we werent home. I think the lord sent us away and he spared us. Reporter two dozen severe storms, some parts receiving up to half a foot of rain to some parts of texas and wind gusts powerful enough to throw 64 large cargo train cars from the trestle and onto a roadway below. Tonight, as people here continue the massive cleanup effort, authorities are astounded that not a single injury has been reported in these weekend storms. Tom . Kendis, thank you. And indra peterson, the Severe Weather is on the move tonight, right . Yes. From washington through louisiana, look at the heavy rain still making its way through. Through tomorrow morning. And out west, another major storm. 45mileanhour wins. Showers from San Francisco through los angeles. And someone has a foot of snow, great ski season in the pacific northwest. And here in new york city, a completely different story. This was central park, people were having picnics and running in tshirts and shorts. It feels like spring. How long will this last . It feels good, but temperatures 15, 25 degrees above normal. Breaking records. But its not going to last. But well be talking about them going down by next weekend. So look for seasonal winterlike temperatures. But heres the catch. Only for about two days. By the time we get to the holidays, the temperatures right back up. Indra, thank you. And now to the pacific northwest, an enormous black cloud over portland, oregon. The road and slammed into a tanker tank tanker train, catching on fire. The driver did not survive. And from los angeles tonight, a Controversial Police shooting caught on camera. In a new case, a man on a busy street reportedly firing into the air, ignoring calls to stop. And then two officers shooting him, then firing again when he was down. Linsey davis with more of the video, and what police are saying tonight. Reporter the video shows Los Angeles County sheriffs deputies fatally shooting a man walking away from them. They fire repeatedly even after he falls to the ground, attempting to crawl away. The Sheriffs Department says the man, 28yearold nicholas robertson, had a gun pointed at them and refused the officers repeated demands to drop it. They say they recovered a loaded. 45caliber semiautomatic handgun at the scene. More than a dozen people gathered to protest saturday relatives who saw the video saying the shooting seems unjustified, and accusing the officers of using excessive force. They shot him in his shoulder, and he was crawling to this gas station. Reporter Police Released this video on sunday, which clearly shows robertson, walking down the street with a gun in his left hand. When he was shot, he was in front of a crowded gas station. There are two people, two women and three children, in a car at a gas pump that is within five feet of him at the time. If he goes in and takes hostages or shoots somebody, were going to be having a different topic, why didnt the Police Officers do something before he went in . Reporter they say robertson had fired six or seven shots in a nearby residential area. For now, investigators say theyre not making any judgments until all the facts are in. Lindsey davis, abc news, new york. In the bay area, tonight, for more than 350 newborns that may have been exposed to tuberculosis. What were learning about the nurse and the risk to the babies, the mothers, and hundreds of other adults. Heres aditi roy. Reporter tonight, a Major Medical scare in san jose, california. Officials at the Santa Clara ValleyMedical Center are racing to contact over 1,000 people may have been exposed to tuberculosis after a Maternity Ward nurse tested positive for the deadly disease. The hospital has identified 350 newborns, 368 mothers and 308 workers who may have had contact with the nurse between midaugust to midnovember. The hospital posting this letter to its website, while the risk of infection is low, the consequences of a tuberculosis infection in infants can be severe. Hospital officials recommend that the babies protectively take an antibiotic for the next six months to nine months even if they test negative. The judgment is, its safer reporter hospital Officials Say the nurses annual t. B. Test was negative but she was diagnosed with t. B. In november during treatment for an unrelated illness. Since she showed no symptoms, they say the risk of exposure is extremely low. Nearly 10,000 people in the u. S. Develop tuberculosis every year. Here in california, health Officials Say t. B. Rates are twice as high as the nations average because the state receives so many global travelers. Tom . Aditi, thank you. Next to a major alert for consumers, including one scam you probably havent heard of. And the one cheating americans out of the most money every year. Heres gloria riviera. Reporter from threatening phone calls within the next hour they will be at your doorstep to handcuff you and put you behind bars. Reporter to pressure to act now. The issue is extremely serious and time sensitive. Reporter scam artists are bilking americans out of millions. Tonight, a major consumer five biggest scams of the year. The Better Business bureau giving abc news a first look at what its new scam tracker measuring complaints in all 50 states reveals. You can see real time what is happening with the scam and get a profile of the scammers. Reporter number five on the list, fake government grants sold to consumers for a small fee. Number four, fake tech support. Andrea hahn was browsing online when a voice came through her laptop saying it was infected. She called the number on the screen and they took control of the computer. Reporter number three, those fake sweepstakes asking for a small fee to collect a prize. Number two, aggressive debt collectors impersonating authorities. Number one on the list, the irs scam. Still surging this holiday season, 2,000 reports a day, Victims Losing altogether 1 million a month. He said ill be going to jail and agents would be coming to handcuff me and take me away. Of them. He lost 500. To protect yourself, remember the basics. Be wary of unsolicited communication, dont engage, and never send money by wire or debit card. It felt very bad, very bad. Reporter gloria riviera, abc news, washington. All right. We thank gloria for that report. Still ahead, its one of the hottest gifts. So, why is amazon taking down certain kinds of hoverboards . Weve seen some catch fire. The new concern with their and later, spectacular holiday homes lighting up the night. But could some decorations be blinding pilots . The new concern in the skies, coming up. Why pause to take a pill . Or stop to find a bathroom . Cialis for daily use is approved to treat both erectile dysfunction and the urinary symptoms of bph, like needing to go frequently, day or night. Tell your doctor about all and medicines, and ask if your heart is healthy enough for sex. Do not take cialis if you take nitrates for chest pain, as it may cause an unsafe drop in blood pressure. Do not drink alcohol in excess. 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That manufacturer, swagway, says it meets all safety requirements. Telling abc news, were glad this is taking place. Especially in light of recent concern over lithiumion batteries is also prompt ing american and delta to join united and jetblue in banning hoverboards on planes. And experts say not to charge them overnight. Brian fong says buyers should avoid lowerquality boards. Under 300. Shana haines bought a twowheeler for her 10yearold daughter. But now has second thoughts. You sent it back, why . I didnt want to take the risk. Reporter even hannah says off her list. I dont really want it anymore. Reporter clayton sandell, abc news, denver. Action. Ransacking a star athletes house and stealing something she and why this top dog is up next. Where to go. And how to deal with my uc. To me, that was normal. Until i talked to my doctor. She told me that humira helps people like me get uc under control and keep it under control when certain medications havent worked well enough. 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