plus, the inside story of the deadly shootout with police from one of the cops chasing them down. you've seen the terrifying scenes like this. now amazon, taking down certain hoverboards over fears of fire. tonight, the concern that has some parents saying, "no way!" good evening. sunday. i'm tom llamas. we begin with a major shift in the race for the white house. a republican contender coming on strong. polls show that ted cruz is now the man to beat in iowa. leaping 21 points, a record-breaking surge. the iowa caucus is now just 50 days away. the republicans are set to face off in a debate on tuesday, and trump already trying to take down cruz. mary bruce is at the white house tonight.

ted cruz is cruising, passing donald trump in iowa. it's a meteoric rise for the texas senator, a 21-point gain since october in one poll. so far cruz and trump have been friendly rivals, but trump is now taking aim. >> when you look at the way he's dealt with the senate, where he goes in there like a -- you know, frankly, like a littleit of a maniac. he'll never get anything done. that's the problem with ted. >> reporter: this after cruz questioned trump's ability to be commander-in-chief. >> it's a question of judgment. >> i would say i have far better judgment than ted, and i think i have aeally great temperament. >> reporter: and trump has a new message for any gop party leader conspiring against him. >> i'm sorry i did this to you, but you've got to get used to it. it's one of thoslittle 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 wasn't -- i wasn't excited when they were up.

down. you know, this is a very fluid contest. >> reporter: and it looks like they may a new candidate to contend with. >> i've made a big decision, i'm entering the race for president of the united states of america. >> reporter: "saturday night live" bringing back will ferrell as president george w. bush. cruz is rising just as republicans get to ready to face off in their fif debate on tuesday. where trump will be center stage. but for the first time, cruz will be standing right next to him. tom? >> mary, thank you. and the democrats will debate this week as well. join david muiuir and martha raddatz one week from tonight, saturday, december 19th, 8:00 p.m., 7:00 p.m. central, right here on abc.

terrorist attack in san bernardino and if it might have been stopped. also tonight, inside the chase and the shootout with the police officer right behind the killers' black suv. here's kayna whitworth. >> reporter: tonight, investigators testing what they dredged out of this lake after three days of searching. still no word whether they've found any traces of that missing hard drive belonging to syed farook and tashfeen malik. a digital footprint that could prove critical for investigators id 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 wouldn't have gotten a visa. maybe those people in san bernardino would be alive. >> reporter: malik vetted by department, and had a criminal background check. scrub cial media. after the attack they found malik's facebo post critical of moderate muslims. now w the "nework times" reports she also talked openly on social media in support of violent

of it." >> i'm 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 shtings. it's outrageous that this isn't already done. >> reporter: tonight, one of the officers who chased the killer couple dowown speaki out. >> they haven't stopped. and the back window of their suv shatters. and i see gunfire coming out of it. >> reporter: the black suv pulls over. rook gets out and starts firing. capps gets out to return fire. >> i saw him shooting at a deputy. that's when i opened fire on him. >> reporter: the terrorists were killed in that shootout. the first time in his 21 years on the force that he ever fired. and more than 100 million

the worst of it in texas. one of three confirmed tornadoes destroying this neighborhood. high winds knocking this trainin off its tracks. kendis gibson in texas tonight. >> reporter: tononight, a ew from the air of devastation across the state of texas. >> wow. i think that's a tornado. >> reporter: in willis, the tornado destroying roofs, uprooting trees, toppling vehicles. tiny lindale, described as a disaster area by its first responders. tornadoes damaging up to 50 homes. >> we are striving to keep necessary people out and have only the people at need access into t this area >> reporter: the twister coming within feet of luke griffin's home. where did it go? >> it just started back that way towards the high school and you can see up there on that lane where just came through here. it was just a white wall of stuff flying everywhere. >> reporter: jennifer skender, out christmas shopping when the tornado ripped apart her home of

a neighbor texting her these photos of her r house. >> i'm just greful that we weren't home. i think the lord sent us away and he spared us. >> reporter: over the weekend, two dozen severe storms bringing 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 ononto a roaay below. tonight, as people here continue the massive clean-up effort, authorities are astounded that not a single injnjury has en ported in these weekend storms. tom? >> thank you. and the severe weather is on the move tonight, right? >> yes. from washington through louisiana, look at the heavy rain still making its way through. expected to affect the midwest tomorrow morning.

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 having picnics and running in t-shirts and shorts. how long will this last? >> it feels good, but temperatures 15, 25 degrees above normal. but we'll be talking about them going down by next weekend. look for seasonal winter-like temperatures. but only for about two days. by the time we get to the holidays, the temperatures right back up. >> thank you so much. and now to the pacific northwest, an enoous black cloud over portland, oregon.

explosion, and workers trying to keep thehe -- the driver died in that crash. and 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, and firing again when he was down. linsey davis with more of the video, and what police are saying tonight. >> reporter: in lynwood, the video shows los angeles cocounty sheff's deputies fatally shooting a man walking away from them. they fire repeatedly even after he falls to the ground, attempting to crawl away. the sheriff's department ss the man, 28-year-old nicholas robertson, had a gun pointed at them and rused the officers' repeated demands to drop it. they say they recovered a loaded .45-caliber semi-automatic handgun at the scene. more than a dozen people gathered to protest saturday evening. retives who saw the video saying the shooting seemed unjustified, and accusing the officers of using excessive

>> they shot him in his shoulder, and he was crawling to this gas station. >> reporter: police released this video on sunday, which clearlrly shows bertson, walking down the street with aun 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 goe in and takes hostages or shoots somebody, we're going to have having a different topic, why didn't police officers do anything? >> reporter: they say robertson had fired six or sevenhots in a nearby residential area. for now, investigators say they're not making any judgments until all the facts are in. lindsey davis, abc news, new york. ;. in the bay area, tonight,

nurse and the risk to the babies, the mothers, and hundreds of other adults. here's adidi roy. >> reporter: tonight, a major medical scare in san jose, california. officials at the santa clara valley medical center fear 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 the 350 newborns, 368 mothers and 308 workers who may have had contact with the nurse between mid-august to mid-november. 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 it safer to treat than not to treat. >> reporter: hospital official say the nurse's annual t. test

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 us develop tuberculosis every year. here in california, health officials say t.b. rates are twice as high as the nation's because the state receives so many global travelers. next to a major alert for consumers, iluding one you probably haven't heard of. and the one cheating americans out of the most money every year. re's gloria riviera. >> reporter: from threatening phone calls -- >> within thnext hour they will be at your doorstep to handcuff you and put you behind bars. >> reporter: -- to pressure to t now. >> the issue is tremely serious and time sensitive. >> reporter: scam artists are bilking americans out of millions. tonight, a major consumer advocate revealing the

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 in 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 voioice came rough 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 i impersonang authorities. number one on the listst, the ir scam. still surging this holiday season, 2,000 reports a day, victims losing altogether $1 million a month. >> he said i'll be going to jail and agents would be coming to handcuff me and take me away. >> reporter: kevin lemon is one of them.

remember the basics. be wary of unsolicited communication, don't 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. sll ahead, it's one of thee hottest gifts. so, why is amazon taking down certain kinds of hoverboards. some have caught fire. the new concerns with their batteries. and later, spectacular holiday homes lighting up the night. but could some be blinding pilots? the new concern in the skies, coming up. why pause to take a pill? or stop to find a batathroom? 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 your medical conditions and medicines, and ask if your heart is healthy enough for sex.

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but now amazon is no longer selling several hoverboards. here's clayt sandell. >> reporter: after frightening scenes likee this. a hoverboard suddenly catching fire in a washington state mall. >> it's on fire! >> reporter: the federal consumer product safety commission sayays it is w testing ten hoverboards in nine states. now, megaretailer amazon has stopped selling at least one brand firefighters say ignited new york home. that manufacturer, swagway, sasays meets all safety requirements. telling abc news, we're glad this is taking place. especially in light of recent concerns with the fires with the poor quality batteries." concern over lithium-ion batteries catching fire has now prompted american and delta to

banning hoverboards on planes. brian fong says buyers should avoid lower-quality boards. and avoid charging them shana haines bought a two-wheeler for her 10-year-old daughter. you chaed your mind, why? >> i didn't want to take the risk. >> i don't really want it ananymore. >> reporter: really? you're kidding me. clayton sandell, abc news, denver. coming up, burglars ransacking a star athlete's house and stealing something she feels is very precious. nd why this dog was awarded a estious medal. up next. and how to deal wiwith my uc

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first time ever, and since they can't drive, many of them took uber to the election site. now to some holiliday home lit up so brightly, they could be dangerous to pilots flying overhead. the faa concerned tonight over popular laser lighting kits like starshower. the lights so powerful, they've been spotted by pilots thousands of feet above the ground. the agency urging consumers to make sure the laser projectors are pointed at the homes, and not towards the sky. we want to show you an image going viral that caught our attention today. this military dog named rock and the purple heart capturing the hearts of so many americans. rocky and his handler, army specialist andrew brown, were injured by an n explosioin afghanistan earlier this month. after several surgeries, the brave duo are doing well. when we come back, a surprising burst of holiday cheer. these kids thought they were just getting a jolly picture with santa. but then the best christmas

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finally tonight, home for the hallolidays, some servicemen surprising their families for the holidays. here john donvan. >> reporter: look at that kid's smile.

guy in the background? it's the time of the yeaear for happy prank,ads surprising their boys in gymclass. or hide behind santa, like trent baskerville did. >> i'm very anxious to see them. >> reporter: 6-year-old jordan took a moment to thank the man in red. and this brings us to t photo. here's what actually happened. rob stella had been gone a year in the navy, took a while for the kids to spot him on this day. but here's what you get. and a reminder that happiness on a kid's face can also look like this. john donvan, abc news, washington.

ever. "gma" in the morning and david muir right back here tomorrow night. i'm tom llamas in new york.

good night. [m james/wx wall weather adlib: temperatures will begin to drop off a little sunday night, parts of western iowa could see a changeover to snow with snow totals between a half to two inches possible. rain showers will be ending monday by midday in central iowa and clouds with very windy conditions will stick around for the afternoon. expect to see wind gusts of 30mph. highs monday will top out in the 30s and 40s. thirties for highs return to central iowa by mid- week and linger through the rest of the work week with few chances of any precipitation falling.