The Republican Party holds round five in its series of president ial debates tonight. This one in las vegas. Donald trump will be front and center with ben carson on his right and ted cruz on his left. New Jersey Governor Chris Christie was a late add. A Des Moines Register poll of likely iowa ccus goers shows cruz leading by ten points with just seven weeks to go before the caucuses. Nancy cordes reports. Reporter this is the second poll in less than a week to show cruz leading the gop field in iowa. The Trump Campaign trashed the poll, while trump himself chose to trash cruz, saying hes unfit for the job. I dont think hes qualified to be president. Reporter donald trump had this message for gop leaders who might think his support in awhat is waning. I dont go down, i go up. Im going to win. Reporter and he went after his sometimes ally ted cruz after promising for weeks he wouldnt. You look how hes dealt with the senate where he goes in there like a maniac. Reporter on twitter, cruz crushed off the comments. Maniac posting a link to this 1980s clip to the song maniac. Cruz refrained from attacking trump. I like donald trump. A lot o o our friends h he have encouraged me to criticize and attack donald trump. Im not interested in doing so. Reporter nationwide, the real estate mogul still has a big lead, beating cruz by nearly 20 points in the latest cbs News New York times poll. Still, his willingness to take on both sides of the washington establishment resonates with iowa conservatives. The way Republican Leadership punishes anyone who stands up to the cartel rorter that approach has made him unpopular with leaders in his own party. Brian walsh worked to elect republicans to the senate in 2010 and 201. He would be equally problematic. Reporter why . If were going to win in 2016, we need to expand the electorate. We need more females and hispanics. Instead of learning those lessons, you have candidates like cruz and trump who are doing the opopsite. Meanwhile, trtrps comments on banning muslims from entering the United States is becoming a drag to his business interests overseas. Julianna goldman reports from washington. Reporter donald trump has made his fortune in part by plastering his name around the world from washington, d. C. To istanbul, people have bought into the trump brand as a symbol of luxury and success. But with each new controversy, more and more Business Partners are severing ties. These high rises in turkey bear the name off donald trump. Some who work inside trump towers in istananl say the buildings namesake has given them reason to quit their jobs. This 20yearold Sales Consultant said trump should close the building. There are muslim people working here. This is affecting me in an unfavorable way. This week, a major middle east retailer, with 190 department stores, stopped selling the trump home decor brand. In stanford, connecticut some in the Muslim Community arere calalng on the developer to strike trumps name from this high rise. And at this trump residence in new york city its embarrassing to have his name on the building. Reporter gordon gray with the u. S. Chamber of commerce said he cant calculate the damage to trumps reputation in the muslim world. He gets the nomination, that prolongs ss ss his exposure in the public eye. Reporter since he declared his candidacy, trumps rhetoric may have had a cost. After his cost about mexican immigrants, more than a Dozen Companies from macys to the pga and nascar severed ties. Those are small in his empire compared to his real estate fortune. He has several projects in the muslim world. Its very hard to quantify the consequences exactly, because its not just dealsls he mayay or may not lose, its deals that you dont know he may or may not have gotten. So thats always the big question mark out there. Reporter trumps own Financial Disclosures dont break down theollar amount of each investment, but forbes estimates that last year trump brought in about 128 million in branding and licensing fees. In other news tonight, dog flu. Theres a new strain this year, along with a new vaccine to fight it. But as m mly hall reports, the shots are expensive and may not be necessary. Reporter veterinarian katie grib says a new strain of canine flu that started in chicago last spring is spreading fast and has proven deadly for some dogs. This type of the virus progresses so quickly, it moves into the lungs, causing severe pneumonia. Reporter the United States department of agriculture has address the epidemic. Its being shipped to veterinarians right now. Its a totally novel virus. Dogs dont have u. S. Dogs dont have any historical experience with this virus. Therefore, they have no protective cross reaction with any other antibodies that theyve formed in the past. Reporter since the epidemic began, more than 1500 dogs became ill in a few months. At least eight died from secondary infections. The strain has now spread across the country. The new strain is dififrent from the common dog flu, which already has an effective vaccine available. In some cases, two vaccinations might be necessary. The old shot can cost up to 90 for two rounds. The vaccine for the new strain costs double that. If your dog is in close contact with other dogs very frequently, then its extremely important to be thinking about and talking to your vet about doing this vaccine sesees. Reporter veterinarians dont know how effective the new vaccine will be. They hope down the road, a shot will be developed that covers both strains of flu. For now, check with your vet to see how common each flu is in your area. If your dog never leaves the yard, youre probably safe. Be right back. beat begins strangelove strange love gucci guilty the fragrances for him and for her man sternly where do you think youre going . Mr. Mucus to work, wi you. Its taco tuesday. Man youre not coming. I took mucinex to help get rid of my mucusy congestion. Im good all day. [announcer ] mucinex keeps working. Not 4, not 6, but 12 hours. Some day soon, you wont need a superman cape or special glasses to see through walls. Researchers at m. I. T. Are making real breakthroughs in the technology. Its a story i first reported for cbs this morning. Step on the campus of m. I. T. And youre likely to get a glimpse of the future. There are drones and plenty of robots. And another with a soft enough grip to handle an egg. Soso of the most recent breaeahroughs, however, arar happening here at the ununersitys Computer Science and Artificial Intelligence lab. Where this simple looking box algarhythms. This shows the ability if tracking people through walls. Reporter dina is the professor leading the project, which has this ph. D. Student demonstrating a wireless technololo. So hes not wearing anything special . Its just picking up his movement through the wall . Yeah, no cell phone, no sensor, no pendant. Its purely based on how the signal reflects off our body. Reporter what was the inception for this . We work on wireless networks. The question is, can we use this for purposes other than communication . Can you sense the environment with it . Reporter it not only detected his position in the room, but his elevatiti f fm the floor. You want to see the red dot fall . Reporter yeah, lets see the red dot fall. Researers hope it can protect when it detects a fall, it sends a message to the caregiver. Reporter thats just scratching the surface of emeralds capabilities. It hones in onn his vitals, respiration and heart at. Being able to get the heart rate, wow, its that sensitive. Reporter and its not in any way as dangerous as say constant exposure to xrays would be . No, not at all. I tell people all the time, the technology is the same carrier as wifi. Its actually 10,000 times or more lower power than wifi. So if youre not worried about wifi in your home, you shouldnt be worried about this. Are there any privacy concerns about this, like maybe a burglar can use this to see where you are in the house . Basically like with any new technology, it comes with a challenge. As society discovers new technologies, there are rules and laws a person has to abide by. If you look at that over there reporter after more than three years, the m. I. T. Team demonstrated their workkor the president lastummer. What was his reaction to this . So i think when he saw the breathing and heart rate, he said, wow. That potentially has applications for baby monitors. Reporter the goal now is to take it to peoples homes within the next year. If you and your partners have this great invention that has huge promise, do you stay a professor or become a businesswoman . Is there a reason not to be both . Reporter is there enough hours in the day to be both . I have 24 hours a day. Holiday. I come to the lab and my students say oh, yeah, its a holiday today. So i think there arelenty of hours as long as a person is interested in what they are doing. And having a great team like i have here. They also point out that First Responders could benefit a great deal by knowing exactly where people are in life threatening situations. E like her. I like that she kind of told you, yeah, she can do it. I can be both. I just ask the questions. And i think its good seeing through the wall, because i was concerned that you could physically see like if someone was Walking Around naked. Its like sonar. And do with that information what you will. Thank you. Got to go. [ laughter ] this is new information for me. You knoww what . The news is back in the morning. What can we say . What can you say . The cbs overnight news will be right back. Imagine how your doctor feels. As a urologist, i have performed 9,421 and a half prostate exams. So why do i do it . Because i get paid. Und. On this side of the glove i know prostate exams can save lives. So, if you are a man over 50, talk to you doctor to see if a prostate exam is right for you. If we can do it, so can you. Cbs cares. Want to do Something Special this Holiday Season . Support i have a dream foundation. Help a child achieve the dream of a higher education. Cbs cares. Organ donation can truly provide a Second Chance at life. Find out how you can help someone in need be a real survivor. Go to donatelife. Net. Cbs cares. Want to do Something Special this christmas . Support i have a dream foundation. Help a child achieve the dream of a higher education. Wisconsin has a state pastry called the crinkle and its a big hit. Reporter in racine, wisconsin, the holidays are all about the kringle. Theres certain skill involved in making the wisconsin state pastry. Good lord, thats a lot of dough. It takes lots of this. To make the dough flaky. Then you have to do this, again and again, to make the 36 layers. Does everybody do this much by hand . As far as i know. I think were the last ones. Reporter for four generations, bensons bakery has been mastering the technique. You can see the layers. Reporter when the benson family opened its bakery 81 years ago, they followed the danish tradition of a prereel shshed pastry. Complete with a kringle queen and kringle inspired polka. Originally the danish pastry had an almond filling with raisins. Now ben, jr. And his son, ben iii, make close to 30 flavors. My grandpa, until he died, would say, just keep the quality and youll be here forever. Im still here. Reporter not far from bensons is this danish bakery, family run since 1949. That looks good. We make our own fillings here. Reporter the owner took us on a tour of his 39,000 square foot facility. Daily, they make 5,000 to 7,000 krin kringles. In the 1950s, some of the bakers started shiftininthem as a gift. So the word kind of spread. People come here because we have kringles. Reporter at larsons bakery, they combined techniques rolling the dough by machine. Don hutchisons father bought the bakery in 1969, and he says a kringle from anywhere else just isnt the same. You cant get a new york bagel anywhere else, because they put the time and labor into making it right. And thats cbs overnight news for this tuesday. For some of you, the news continues. For others, check back with us later for the morning news and cbs this morning. From the Broadcast Center in new york city, im don dahler. The commander in chief tries again to reassure an anxious nation. We are fighting isil harder than ever. Cbs news is on the frontlines with the kurds, fighting the terror group on the ground. Also tonight, trailingngn iowa, trump goes after frontrunner cruz. I iont think he has the right temperament. Controlling the soaring drone population. Owners will soon have to register. And the sounds of growing harmony between cuba and the United States. This is the cbs overnight news. President obama revealed operations commandos he ordered into syria are now on the ground and have begun to work with local forces fighting isis, or as he prefers to call the group, isil. This was the president at the pentagon. Were going after isil in downtown raqqah to libya, where we took out the isil leader there. The point is, isil leaders cannot hide, and our next message to them is simple you are next. Every day we d dtroy as well more of isils forces, their fighting positions, bunkers, and staging areaea their heavy weapons, bomb making factories, compounds and training camps. In many places isil has lost its freedom to maneuver, because they know if they mass their forces well wipe them out. Since this summer, isil has not had a single Successful Ground in either syria or iraq. In recent weeks, weve destroyed hundreds of their tanker trucks, wells, and refineries. And were going to keep on hammering those. Isil also continues to lose territory in iraq. Isil had already lost across kircut province and in tikrit and more recently, isil lost at sinjar, losing a strategic highway. Isil lost at baiji with its oil refinery. We saw during the daring raid supported by our special forces, which rescued dozozs of prisoners from isil, w wch Master SergeantJoshua Wheeler made the ultimate sacrifice. So far isil has lost about 40 of the Populated Areas it controlled in iraq and will lose more. Iraqi forces are now fighting deeper into ramadi and working to circle fallujah and cut off supply routes into mosul. Accelerating the war in syria and iraq after isis bombed a russian jetliner, directed the attack in paris and inspired another in san bernardino. Tonight we have a rare look at what u. S. Forces are facing. Charlie e agata linked up with americas kurdish allies. His story begins in iraq. Reporter even when colonel badal bandi told us his forces face isis attacks every day, we didnt expect this would be one of them, until he showed us where three suicide car bombers tried to charge their outpost at dawn. His soldiers shot the drivers dead before they detonated their bombs, but the car bombs remained no more thaha50 yards away. [ explosion ] here on the front line, the bomb squad is a. 50caliber gunner. The first went up in a plume of he then opened up on the car in the ditch, the one much closer to us. We watched until he finally made a direct hit. [ explosion ] the massive explosion blew shrapnel in every direction and filled theunker with choking dust. That noise is debris from the bomb and wreckage from the car that came crashing down. Everybodys ears were ringing, but no one was hurt. Hours later, we crossed into syria where rebel commander colonel Talal Ali Selo gave us a grim picture of just how many Suicide Missions theyve seen. Can you give me an idea, how many have you had to face in the past month . 42 car and truck bombers, said, three on motorcycles and four suicide bombers on foot. This week three car bombs killed 28 people. The colonel told us the town had run out of sugar, so to get past checkpoints, isis hid the bombs in trucks delivering sugar. You went to the funeral today. What are people there telling you . They want revenge for the dead, he told us, and they want us to make sure this doesnt happen again. The coconel told us although they stopped most attacks, scott, its hard to stop them all because isis is constantly changing tactics. They never know when theyre going to strike, and they seem to have an unlimited supply of suicide bombers. Charlie dagata on the battlefield, thanks. Theres also apparently an unlimited supply of followers coming to the west. So today the white house is reviewing how immigrants are screened. One of the terrorists who killed 14 in califofoia wrote online two years ago of her desire for then she got an american visa. Jeff pegues has more. Reporter when Tashfeen Malik applied for a fiance visa in 2014, she had her name and face checked against terror watch lists, but whether she posted radical views on social media was not checked. Alberto fernandez until recently ran the state Departments Program to counter isis online. Nowadays every company that hires is looking through your social media. Yes. Reporter should d e government be doing more . This is the crazy thing about this debate. You would think that people who are trying to come to the United States to live in the United States, a privilege that most people dont have, would actually have that scrutiny. Reporter the department of Homeland Security says it began three pilot programs in 2014 to examine whether screening social media was consistent with current laws and privacy protections. Today government officials dismissed allegations Homeland Security secretary jeh johnson delayed the implementation of new rules because of Public Relations concerns. A review of the policy is under way. Since the attack, some members of congress have been demanding changes to the visa screening system. New york senator charles schumer. And had they checked out Tashfeen Malik a little more, maybe she woul