In jail. Instead, hes headed to the white house at the invitation of the president. Heres Mark Strassmann. I made it to impress my teachers. Reporter on monday Ahmed Mohamed brought to school this homemade digital clock, a Circuit Board wedged inside a pencil case. He showed it to his engineering teacher but told us it was his english teacher who got alarmed when the block beeped inside his backpack during class. I brought the clock to my teacher and i showed it to her after class and i plucked it in and showed it to her that it was a working clock and she told me itlied a bomb. Reporter he was arrested for building a hoax bomb. I felt like i was a criminal. I was profiled as a terrorist. Reporter he was fingerprintd and taken to juvenile detention. School district spokesperson lesley weaver. We were doing everything with an abundance of caution to protect all of our students in irving. Reporter police later concluded the device was harmless, just a clock as mohamed said all along, and denied to place charges. We live in an age where you cant take things like that to schools. We have seen across our country horrific things happen. We have to err on the side of caution. The reaction would have been the same regardless. Reporter but social media exploded in out rage. People posed with clocks in solidarity, the hashtag, i stand with ahmed was repeated. Facebook founder Mark Zuckerberg invited him to stop by and president obama tweeted, cool clock, ahmed. Want to bring it to the white house. We should inspire more kid like you to like science. Its what makes america great. Yi think i was going to get and supporters because i was muslim and i didnt think anyone would care about that. Reporter mohamed has been invited to the white house next month for an astronomy night to meet with government scientists. He is still serving a threeday school suspension. He told me Neither Police nor School Officials have apologized. Pelley Mark Strassmann in irving for us tonight, mark, thank you. You can hear more from Ahmed Mohamed tomorrow on cbs this morning. Tonight, the stakes are high for the top 11 candidates for the republican president ial nomination as they meet for a second time in a primetime debate, this one at the Ronald Reagan president ial library in simi valley, california. Major garrett is there for us tonight. Major. Reporter the matinee debate has begun featuring the four republicans saddled with the lowest poll numbers in this race, and, therefore, desperate for attention. But even some republicans on the primetime stage also hungry for attention have had to resort to some oldfashioned campaign gimmickry. Kentucky senator rand paul fired an ar15 at the federal tax code this morning to grab attention and take another shotta g. O. P. Frontrunner donald trump. I think if you get trump, you get more of the same, and i dont think everybody sees that yet but i see him as the consummate insider. I see him as someone who buys and sells politicians. Hes a classic narcissist who thinks he is so smart and so allpowerful that hell just take care of the chinese. Well, how . Reporter trump, no longer the novelty frontrunner, is now the main target for paul and most other g. O. P. Challengers, all of whom trump dismisses as incapable of dealing with china, russia, or iran. Theyre very nice people. But theyre never going to do anything with these countries. Theyre never going to be able to do it. Its an instinct. Its something thats special. They dont have it. Believe me, they dont have it. Reporter but the latest cbs News New York times poll shows other nonconventional candidated could challenge trumps outsider dominance. Neurosurgeon ben carson, who drew a huge crowd of reporters at tons debate site, has risen from 6 to 23 . And Business ExecutiveCarly Fiorina climbed from less than 1 to 4 . Fiorina fought her way on to the main stage tonight and has promised to joust with trump. Scott, republicans looking to take trump down a peg or two are likely to question whether he has the depth of knowledge or the temperament to be president. Pelley major garrett, thanks. Well, now lets measure the depth of knowledge of john dickerson, our cbs news political director and, of course, the anchor the face the nation. John, how do these contenders take a swing at trump . Reporter very carefully. They all have a strategy for taking on trump but every candidate who has tried to do it, with the exception of Carly Fiorina, and shes one to watch tonight, every candidate who has tried has gone down in the polls. So the real challenge for these candidates is to deal with trump, but also to make the case for their own candidacy. Thats what voters will be attracted to. Pelley its amazing the names that we dont talk about anymore, like jeb bush and scott walker. Reporter those are the two candidates, probably the two to watch, in terms of those who need to make the pitch for why they should still innocent conversation. They need tomorrow to be the one people are talking about. This race is going to come down to donald trump and the alternative to donald trump. And both walker and bush can make the case that theyre governors, they know what to do in the job. But they have to give listeners something to hang on to, and so far in the first debate, anyway, they kind of faded into the background. Pelley john dickerson, well see you sunday on face the nation. Thanks, scott. Pelley today, a top pentagon official acknowledged that a key part of the president s plan to defeat isis is not working. The strategy is to use american air strikes and troops trained by the u. S. To roll back the islamic extremists controlling much of syria. Heres david martin. Reporter the plan called for a force of 12,000 Syrian Opposition fighters that, with the help of american air strikes, could take back territory from isis. Training began last spring at bases in turkey and jordan, and the first fighters were infiltrated into syria this summer. But when senator Debra Fischer asked general lloyd austin, commander of the war in iraq and syria, how they were doing, she got a shocking answer. You can tell us what the total number of trained fighters remains . Its a small number, and the ones that are in the fight is is is were talking four or five. Is it still the goal to have about 12,000 of them there . At the pace were going, we wont reach the the goal that we had initially established for ourselves. Reporter next came senator kelley ayotte. This four or five u. S. Trained fighters, lets not kid ourselves. Thats a joke. Reporter then senator Clare Mccaskill asked the pentagons christine warmugt how many fighters were still in training. Its between 100 and 120. If we end up at the end of the year with us bragging about the twirches between 100 and 120, its time for a new plan. I certainly dont mean to be bragging. The program is much smaller than we hoped. Reporter and likely to remain that way, scott. The pentagon insists its not giving up on the effort to train syrian fighters, but it will be drastically cut back to a fraction of the original plan. Pelley from 12,000 to four or five. David martin at the pentagon for us. David, thank you. Today, hungary resorted to tear gas and Water Cannons to force back refugee families. Many of them are fleeing the civil war in syria. Theyre trying to reach germany which will grant refuge, but hungary doesnt want to be the corridor for that. Tonight, the search goes on in southern utah for a hiker missing in a flash flood. At least six others were killed, and ben tracy is there. Reporter searchandrescue teams covered dozens of miles of rugged terrain in Zion National park. Do you expect at this point to find anyone alive . Were hopeful, but its not looking good. Reporter on monday, the group of seven was inside keyhole canyon, which is only three feet wide in some part. Terez picard of the National Parks service. It is dark and it is cold. I can tell you even in july, its chilly. Reporter the canyon filled with water when massive flash floods hit southern utah. There goes the van oh, my goodness reporter the same storms washed away vehicles in a nearby town. 12 people, most of them children, died. A sixyearold boy is still missing. Couldnt really stand out in it for sure. You had to seek shelter. Reporter Anthony Bentley was hiking in zion when water started pouring off the massive mountains. There is little vegetation to slow a flood once the rain starts falling. How fast did that rain start coming . Its it started out as a pitapat, and over a couple of seconds it became torrential, yeah. Reporter park rangers say this group of hikers was warned of the potential for flash flooding before they headed out on monday. Scott, this is now the deadliest event to ever happen here at Zion National park. Pelley ben tracy in the canyon lands tonight. Ben, thank you. Tonight, searchers are looking for victims of a wildfire north of san francisco. More than 10 nine square miles have burned since saturday. David begnaud is there. Reporter today, cadaver dogs were brought into the lake county disaster zone to search for bodyies. Authorities sale cbs news at least four people are unaccounted for and feared dead, including former San Jose Mercury newspaper reporter leonard neft. Brian martin is the lake county sheriff. It moved so fast in several cases people couldnt beat it. They couldnt beat it out of here. Reporter telephone lines and emergency Communication Systems have been burned. There is no water or power. Animals are left to roam helplessly. This is the worst disaster this county has ever seen. Reporter today, city officials were in the burn area surveying damage. Mark ghilarbucchi is the governors top emergency manager. This is equivalent, by, you know, by scope and scale to any major hurricane that would have hit the east coast. Reporter in the Anderson Springs neighborhood, there is nothing left. The dugan family lost their home just six months after the children lost their mother to cancer. Grandmother marsha conns. Was there insurance for the home where the kid lived. No. Reporter no. What do you do next . We dont know. Were here for a few days, and then we dont know. Reporter sevenyearold griffin, who cant grasp the gravity of the situation, would not let go of his teddy bear. Do you feel happy . Such innocence in the face of the disaster. Scott, right now rain and cooler temperatures are providing relief to firefighters, but it is expected to be warm and dry again tomorrow. Pelley david, thank you. Today police and federal agents broke up an spirnl ring that sold cheap but toxic synthetic marijuana. In two months, 2300 people have ended up in Emergency Rooms in new york alone, and jim axelrod is investigating. Reporter in the last 24 hours, agents seized two warehouses full of synthetic drugs in the bronx, one of the largest raids ever. But with new york drug rings producing more than a quarter million packets of synthetic marijuana, todays bust is just a small dent in the problem. This is one of the brands that is kind of very popular right now among synthetic drug users. Reporter Eduardo Chavez is with the dea. Over the last several years, our special testing labs have identified over 400 new synthetic drugs. Reporter 400 . Absolutely. Reporter known by names like k2 or spice, the synthetics are designed to mimic marijuana but with far more powerful effects. Oh i have had routine heroin users tell me that theyve tried spice one time and hated it, were so scared of it, that they would never try it again. Reporter the chemicals used to make the drugs are legally imported from china. Theyre sprayed on to groundup plant here, and then smoked. This is k2. Is it . Yeah. Reporter its cheap and easy to find. This was a bodega in brooklyn. Two of them . One, one 10. Reporter in the last years, theres been a 229 hike in calls to poison control centers. Emergency room doctor michael glatter. Some horrendous things can happen under the influence. Right. This can cause kidney failure. It can lead to heart attacks, strokes, seizures which dont stop which require a person to be put on a respirator. Reporter but theres an even more troubling threat, where the profits from the sales of these synthetic drugs may be going. Maybe 1,000. A lot of this money that is from the sales of spice is hitting countries in the middle east where we all know drugs many times fund terror. Reporter are you talking about storefronts that are operated by middle eastern owners that might be funneling the money directly back to terror groups . A lot of middle easternopened shops where our investigations have revealed cash deposits going to countries of conflict such as yemen and syria. Reporter sources at the Drug Enforcement agency say an increased commitment from china is the key to cutting down the amount of chemicals coming into the country. The dea is hopeful the two countries can include this on the agenda for highlevel talks that could be held later this month. Pelley president of china coming to washington later this month. Jim axelrod reporting tonight. Thank you. Mr. Stewart goes to washington. Well tell you why. Theres big news tonight from the top of the world. 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Pelley former daily show host jon stewart showed up today in washington, long the home of some of his favorite targets but no one was laughing today. Heres jeff pegues. Reporter who do you blame for this . Whose lawn am i on . Reporter the comedian was there to Lobby Congress to extend the Program Providing medical care to some 70,000 emergency and cleanup workers from the 9 11 attack sites. Everything that they say about this country, about how much they love it, about how much they believe in it is thats all symbolism as far as im concerned if they cant take care of the people that took care of us. Reporter stewart featured the issue on some of his shows, like this one in 2010. Were patriots to this country. Reporter which included endeavour, a crane operator diagnosed with throat cancer. Devlin died in 2014. 56yearold firefighter robert tilearcil, also came to capitol hill today. He said he got cancer from breathing bad air at ground zero. Our only protection was our face piece and our face piece was only good for 15 minutes. Reporter so you were breathing in the toxic air. We were breathing in the toxic air. Reporter stewart said the workers should not have to go begging for money. And theyre being dragged down to washington hat in hand to ask for medicine. Its embarrassing. Im embarassed as an american that that this has to happen. Reporter funding was a major Sticking Point the first time around, and it will be an issue once again as this deadline approaches. Scott, supporters of the legislation say they are still trying to determine how much funding would cost on a permanent basis. Pelley jeff, thank you very much. Three american heroes are about to be honored by the president for stopping an attack on a train. Thats next. When youre not confident your companys data is secure, the possibility of a breach can quickly become the only thing you think about. Thats where at t can help. 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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 may increase your bleeding risk if you take certain medicines. Tell your doctor about all planned medical or dental procedures. I accept i dont have to set records. But im still going for my personal best. And for eliquis. Reduced risk of stroke plus less major bleeding. Ask your doctor if switching to eliquis is right for you. Pelley weve learned that the americans who stopped a gunman on a french train last month are going to the white house tomorrow for a personal thank you from the president. Army specialist Alek Skarlatos will be awarded the soldiers medal. Airman first class spender stone will get the airmens medal and the purpet heart and Anthony Sadler will get the department of defense medal. 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Ask your doctor or pharmacist about prevnar 13® today. Pelley finally tonight, new york is known for its magnificent skyscrapers, but theres an equally amazing world deep below the city. Heres don dahler down under. Reporter we went 10 stories beneath the most densely populated city in the nation to see one of the most Ambitious Construction projects ever. This twomile section of the 2nd avenue subway is expected to be finished by the end of next year. It costs roughly 4. The 3 billion, nearly a third of which came from the federal government. But unlike bostons big dig and san franciscos new bay bridge, this project will come in underbudget and on time, this according to Transit Authority michael horodniceanu. We are about 84 , 85 done, and the next 15 are probably the toughest one to accomplish because were talking about integrating a brand new line with something that goes back 100 years. Reporter the subway line was first proposed in 1919. Over the decades, crisis after crisis derailed the project until it began in earnest in 2007. This is the first major expansion of the new york city subway system in 50 years, and the agency says that there has never been an urban project like this conducted in such a densely populated area. With 100,000 people per square mile above, the biggest obstacle wasnt digging through bedrock. It was disrupting the bedrooms. Here, when you blast and you blast at 9 00 at night, and all the children living in these buildings are awakened by the blast, thats something that when the contractor issued, no one thought about. Reporter so the m. T. A. Launched an aggressive Community Outreach program to show that the mythological subway will some day actually exist. Yeah, here we go. Reporter but for anyone whos ever renovated anything, we understand your skepticism. Don dahler, cbs news, new york. Pelley and thats the cbs evening news for tonight. For all of us at cbs news all around the world, good night. Captioning sponsored by cbs captioned by Media Access Group at wgbh access. Wgbh. Org any lessons that youve learned so far this year . Be grateful for even the bad things. Our sitdown with the newly single gwen stefani. And Victoria Beckham gets slammed for sending toothin models down the catwalk. Thats right now. On entertainment tonight. Models are like 0. 001 of the population. Labeled skeletal spice, are beckhams girls too skinny . Some of them are painfully, painfully thin. Fashion weeks model weight wars. Just what should a woman on the catwalk look like . Plus everythings great. Is gwen stefani putting on a brave face, is miley moving on with dane cook, and is Kate Gosselin heartbroken. Her ex with another woman. The youtube star exposing social media dangers