down cruz. mary bruce is at the white house tonight. >> reporter: tonight, senator 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 little bit 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 a really 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 those little problems in life. >> reporter: trump maintains rong support in iowa even as he denounces the polling. >> the "des moines register" is the worst. they are the worst. >> reporter: but acruz rises, >> poll numbers go up and down. when they were up. i'm not excited when they were down. you know, this is a very fluid contest. 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 risi just as republicans get to ready to face f in their fifth 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 muir and martha raddatz one week from tonight, saturday, december 19th, 8:00 p.m., 7:00 p.m..central, right and new questions about the 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 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 wouldn't 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. but investigators don't always scrub social media. after the attack they found malik's facebook post critical of moderate muslims. now the "new york times" reports memea in support of viololt jihad and "wanted to be a part 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 shootings. it's outrageous that this isn't already done. >> reporter: tonight, one of the officers who chased the killer couple down speaking 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. farook 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 and more than 100 million people feeling it this weekend, the worst of it in texas. one of three confirmed tornadoes destroying this neighborhood. high winds knocking this train off its tracks. kendis gibson in texas tonight. >> reporter: tonight, a view 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 unnecessary people out and have only the people that need access into this area. >> reporter: the twister coming within feet of luke griffin's home. where did it go? >> it just started back that way towas the high school and you can see up there on that lane where it just came through here. it was just a white wall of stuff flying everywhere. out christmas shopping when the tornado ripped apart her home of 11 years. a neighbor texting her these photos of her house. >> i'm just grateful that we ren't home. i ththk 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 texaand 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 clean-up effort, authorities are astounded that not a single injury has been reported in these weekend tom? >> thank you. and the severe weather is on >> yes. from washington through louisiana, look at the heavy rain still making its way expected to affect the midwest tomorrow morning. and the west, 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 wasentral 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 enormous black an accident triggering a loud explosion, and workers trying to keep the -- the driver died in that crash. and in a new case, a man on a busy street reportedly firing into the air, ignorinin calls to stop. d 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 county sheriff'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 says the man, 28-year-old nicholas robertson, had a gun pointed at them and refused 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. relatives who saw the video 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 atat gas pump that is within five feet of him at the time. >> if he goes 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 seven shots in a nearby residentialrea. for now, investigators say they're not making any judgments until all the facts are in. lindsey davis, abc news, new in the bayay area, night, what we're learning about the 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 positiveor 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 ris of infection,is low, the conseqnces of a tuberculosis infection in infants can be severe." hospital officialsecommend that the babies protectively take an antibiotic for the next six months to nine months even if they test negative. >> reporter: hospital officials say the nurse's 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 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, including one you probably haven't heard of. and the one cheating americans out of the most money every year. here's gloria riviera. >> reporter: from threbtening phone calls -- >> within the next hour they will be at your doorstep to handcuff you and put you behind bars. >> reporter: -- pressure to act w. >> 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 reau 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 ofofhe scammers. >eporter: 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 scen 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 g is holiday season, 2,000 reports a day, viims sing altogethe$1 million a month. >> he said i'll be going to jail and agen would be coming to t% handcuff me and take me away. of them. he lost $500. 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, washshgton. >> all right. we thank gloria foror that report. still ahead, it's one of the 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? 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"gmamain the morning and david muir rightack here tomorrow night. good night.steady too.. haven't moved from last night or this morning! still in the upper 30s. tonight. we'll continue to see rain.. brief mix tonight before seeing a few more flakes tomorrow. temperatures still holding their fort in the upper 30s. after we wrap up this system, there's another ononright behind that!t!etails next, but first here's deborah with youou local news! " "