Their families. Both would be illegal until the laws of war. In a statement, trump said that as commander in chief, he would not order u. S. Troops to commit crimes. But it was just last night in the 11th Republican Debate that trump boasted the military would not refuse his orders. That debate sank deeply into pointless insults. Today, conservatives described it with words including embarrassing, suicide, and implosion. It left many republicans feeling they were banging on the cockpit door of a party that had been hijacked with no idea where the g. O. P. Was headed or whether it would land in one piece. Heres major garrett. Millions and millions of people are coming to vote for the republicans, and joining the reporter donald trump today sought to take control of the Republican Party just hours after clashing with his rivals this little guy has lied so much here we go. About my record. Here we go with the personal stuff. He has lied so much. Reporter the rift between trump and the republican establishment continues to grow. Trump canceled his saturday appearance before an annual conference of conservative activists, drawing ridicule from ted cruz. He was told there were conservatives that were going to be here. Reporter those conservatives were skeptical of trump. If he doesnt show up, i think hes kind of dodging whats going on here. I dont think he represents our values at all. Donald trump is a phony, a fraud. Reporter as mitt romney and other g. O. P. Leaders plot ways to deny trump the nomination, Republican National committee chairms Reince Priebus said the turmoil would not hurt the partys chances in the fall. Mr. Chairman, is your party coming apart at the jeems not at all. I think what were seeing is drawm and intrigue. Reporter what is the probability of an open or contested jeengz you know, i dont know about that. Wouldnt go to a contested convention, but whatever the case is, were going to be prepared. Please, i know its hard to interrupt. Thats not what you said in the oped. Breathe, breathe, breathe. Reporter despite the rancor at last nights debate, all the candidates pledged to support eventual republican nominee. Because i gave my word that i would. Reporter at the conservative conference truch is skipping ben carson today formally ippedded his campaign. Carson offered no endorsement but said he left behind being boisterous and loud in high school. Pelley major garrett, thanks very much. The next contest for the democrats are tomorrow in kansas, louisiana, and nebraska, michigan on tuesday. Heres nancy cordes. There were so many insults flying back and forth, it was hard to keep track. Reporter in detroit, the Republican Debate drew a brief mention from clinton, but she quickly turned to michigans economy, taking a tough line on and we dont take action until after the damage is done, which often means after workers are laid off. That is ridiculous. Reporter in traverse city, Bernie Sanders argued he, not clinton, has consistently opposed free trade deals. Nafta and permanent normal train relations with china have cost this country millions of decentpaying jobs. Reporter for both candidates, winning michigan is about more than just delegates. They have both visited waterstricken flint, and both want to show, scott, that they are the ones who are equipped to solve crises like that one when they arise. Pelley nancy cordes, thanks. In another important story tonight, the ceasefire in syria appears to be holding, and that gave our Elizabeth Palmer a chance to explore aleppo, syrias largest city, with two Million People before the fiveyearold civil war. Reporter for three years, in the heart of aleppo, rebels the time the army had won, the world had lost one of its greatest cultural jewels, the citys ancient market. There are some things that people on both sides of this very bitter conflict have in common. One is the destruction, terrible here in the governmentcontrolled area, and down there, with the opposition holds ground, its just as bad. The other things they share are exhaustion and misery. You see that on every side in salahuddin, a poor neighborhood right on the front line, where tarps shield residents from the eyes of snipers and families eke out life in the are ruins. Can we come up and see you . The ganzi family invited us inside. Theres no Running Water or electricity. In their tiny apartment, she explains her son, a soldier, was killed in action. Without his salary, everyone, grandchildren, is surviving on charity. Downstairs, theres a soccer game. Hamad is pretty fast on his crutches now. Its been a year since a rocket took off his leg. Were you coming back from school . No, he says. I was doing errands with my mom. People can still do errand and shop for food in the part of aleppo that havent been smashed to bits, and since the ceasefire, the mood has lightened. Back in the old city, major ghanem, the officer in charge, tells me things are quiet here, too. The soldiers are relaxed, stocking up on supplies in spite of the odd rebel potshot. But whats next . How do you think this will end . I am hoping for negotiations, he tells me. Weve already spilled too much blood. Everyone we spoke to, scott, battered and ground down by this peace through negotiation, butt very same time, the syrian army is tightening a siege on the oppositionheld side of aleppo so things could get a lot worse before they get any better. Pelley Elizabeth Palmer with remarkable, rare reporting from inside syria. Thanks, liz. Our next story got the attention of the entire country today. Even the president mentioned it. Los Angeles Police revealed today that a knife is being tested to see if its connectedly to the 1994 double murder for which o. J. Simpson was acquitted. Heres ben tracy. Reporter the knife given to los Angeles Police was allegedly found nearly two decades ago by a construction worker during the demolition of o. J. Simpsons brentwood estate. The worker reportedly gave it to a policeman. L. A. P. D. Spokesman Andrew Neiman the person we received this knife from is a retired l. A. P. D. Officer who retired back in the late 90s. Officer has not been publicly identified, but hes believed to have had the knife for many years before turning it in about a month ago. Marcia clark prosecuted o. J. Simpson for the stabbing deaths goldman. Tonight. If it does turn out to be connected to the murders of ron and nicole, it would be interesting if there were some evidence on that knife that pointed to who might have helped to bury it if, indeed, someone else did. Reporter the knife used in the murders has never been found. During his trial, simpson famously tried on a bloody glove discovered at his house. That evidence was dismissed by his attorney, johnnie cochran. If it doesnt fit, you must acquit. Reporter the l. A. P. D. Says the story behind this new knife could turn out to be bogus. Do you know whats going on here o. J. s in the back seat with a gun to his head reporter it comes as a cable miniseries recounting the in the case. Its remarkable. I mean, this is the case that never ends. Reporter law professor Laurie Levenson covered the Simpson Trial and says the knife is a Fascinating Development but of little legal significance. Even if they find some evidence on this, they would have to show chain of custody. They would have to show how it got there, and even if they said, it was o. J. s and nicoles he cannot be retried for the murder. Theres double jeopardy. Reporter, of course, o. J. Simpson is already behind bars. He is serving a prison sentence in nevada on an unrelated case. As for this newly found knife, scott, the l. A. P. D. Said they are not sure when they will get the test results on that knife. Pelley ben, thanks. There was a longawaited groundbreaking today in flint, michigan. A crew dug up a corroded lead pipe outside a home where an expectant mother and eightyearold girl live and replaced it with a copper pipe. Heres adriana diaz. Im toni. Im one of the nurses from the health department. Reporter nurse toni larocco was checking on Stephanie Bradleys oneyearold daughter who tested positive for lead in september. Has she been retested . She was retested and it was reporter this is one of five house calls they will make today to keep track of kids with lead poisoning. How has the load of homes you have to visit increased . Its gone up huge, and the numbers of families weve seen have exponentially grown. Reporter Stephanie Bradley said she drank the contaminated water throughout her pregnancy. When you were first told your daughter had high levels of lead, what went through your mind . Well, i was very, very afraid because of how young jung she is, and i didnt know the dangers of it. Reporter five months after flint switched its water supply back to lake huron, nearly 1,000 homes still have dangerous 72 children are still testing positive for high lead levels in their blood. But only half of flints 8,000 children under six have been screened because testing is voluntary. Since lead can remain in the body for decades, the state is developing a registry to track Flint Residents for years. But stephanie says until all the lead lines are out, shell be afraid of how the water is affecting her daughters future. Its making me want to leave the city of flint, to move just because of the water and everything. Its its its frustrating. Reporter the city says right now theres only enough funding to replace 30 lead pipes out of 8,000. Flints recovery will likely be a recurring theme in sundays democratic debate. Scott, its being held right here in flint. Pelley adriana diaz in flint for us tonight. Adriana, thank you. Now, to the economy. Hiring surged last month as the Unemployment Rate held steady at 4. 9 . That is an eightyear low. The latest thing in cars is the stretch loan, to pay for them. A new report out today finds that the average loan runs more than five years now, 67 months for a new car, 63 months for a used car. And the average loan is a record 29,551. Mellody hobson is our cbs news financial analyst. Why are people taking out these longterm loans . During the Great Recession people stopped buying carses. Then what happened, five, six years went by, and car prices outpaced inflation. So in order to be able to afford that 30,000 car, people have pelley whats the huge downside. The longer the payment, the more think about it. A car loan used to be four years. Today, the average loan being 67 months, some as long as 72 months, seven years, means that when you tack on that extra period the average person is spending about 8,000 more in interest. Pelley and so do you think consumers should be taking these loans or avoiding them . Avoiding them. Im absolutely against them, not only the extra interest, which is really expensive, but also the ideal that you could get into a situation later in the loan years where your car is like a house under water meaning the car is worth less than the payments that youre making. Thats not a good deal. Pelley that got us into a lot of trouble before. Mellody hobson, our cbs news financial analyst, thanks so much. Thank you. Pelley scientists cant believe how quickly the arctic is melting. And would you believe anchorage the cbs evening news continues. A heart attack doesnt care if you run everyday, or if youre young or old. No matter who you are a heart attack can happen without warning. If youve had a heart attack, a bayer aspirin regimen can help prevent another one. Be sure to talk to your doctor before you begin an aspirin regimen. Bayer aspirin. 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Farther north, scientists are discovering that the sea ice of the Arctic Circle is melting faster than first thought. This winter, enough ice is missing to cover california three times. Heres don dahler. Reporter the arctic ocean is six million square miles, most of it covered in ice. But last month, the top of the world was up to 14 degrees above normal and broke the record for the lowest amount of ice in february, more than 400,000 square miles short. Its completely unprecedented. People who work up there, you know, go up to the arctic, go out on boats and cruise around to measure these things are reporter Robert Newton is an arctic researcher at columbia university. Its the dead of winter there. Theres no light. Its well below freezing. It should be locked in with ice all the way across, but the ice is significantly retreated, even in wintertime. Reporter the shrinking sea ice could have a potentially disastrous effect on animals, such as polar bears and seals, who depend on the ice to hunt and breathe. Icefree oceans absorb more heat and become warmer, which speeds up glacial melting, raises sea levels even more. Ice is a great reflector of light, which is where most of the heat on the planet comes from. Open water is dark. Its a fantastic absorbedder. Reporter newton says changes in the arctic can also affect weather here, causing storms and droughts to last longer and be more extreme. Fascinating for scientists, but scary for a person . Scientists are both scientists and people, so we are both fascinated and frightened reporter the fear is that changes happening now in the arctic might be irreversible. Newton says the recent Climate Change agreement signed by 195 nations was a start, but, scott, that it doesnt go far enough to reverse the trend. Pelley don, thanks. Big storm coming to the west when we come back. 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Pelley about 100,000 students are sharpening their number 2 pencils for the new s. A. T. College Entrance Exam tomorrow. Its a complete overhaul. The essay is now optional, questions have four answer choices, not five. Theres no penalty for incorrect answers. And ridiculous Vocabulary Words like abstemious are gone, replaced by words students actually use like synthesis. Abstemious, by the way, means austere, and there was nothing for 50 years, the colorful chronicler of tennis in newspapers and on tv. Collins was easy to spot with his bow tie, wild shirts and pants, even at wimbeldon. But collins suffered from parkinsons disease and dementia. He died today at 86. In the west, el nino rains that fizzled in february are expected to storm back in buckets starting this weekend. Nearly a foot in some places could put a dent in californias drought. The Sierra Nevada is in for high winds and heavy snow. Meanwhile, back at the ranch, Steve Hartman next. Feel secure in your dentures. 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Alert your doctor right away as difficulty swallowing, speaking, breathing, eye problems, loss of bladder control or muscle weakness can be a sign of a lifethreatening condition. Dont take botox if you cant empty your bladder on your own or have a urinary tract infection, or uti. Side effects may include allergic reactions, injection site pain, fatigue, uti, painful urination and difficulty emptying your bladder. Tell your doctor your medical history. Muscle or nerve conditions, medications including botulinum toxins, antiplatelets and blood thinners, may increase the risk of serious side effects. Pelley we end tonight with a catalytic conversion. Heres Steve Hartman on the road. Come on reporter all cattlemen face challenges beyond their control but not long ago at this ranch south of houston son clarence thomasy sonnen faced a problem of his own, i doing. You know, every marriage has the issues. Its not always easy. I was as unprepared for it as anybody. Whats that . Reporter it all began innocently enough. Want to come lay down . Reporter shortly after they got married six years ago, renne started hanging out with the livestock. Tome warned her. Renne, dont name those cows. Reporter but she didnt listen. Then she started singing to them, too whos going next in the red trailer reporter and before long, this ranchers wife had turned into a ranchers worst nightmare, a vegan, who couldnt cattle ranch anymore. He was just going to get out of business and our marriage was going to be over. It wasnt working and i said, im going to sell the whole herd. And she said, if youre going to sell the whole herd anyway, why dont you sell them to me. And he looked at me like, you have lost it. You are crazy. Reporter clearly there was some truth to that. But what tommy didnt know was that renne had been secretly posting a blog called vegan journal of a ranchers wife. She attracted thousands of followers, and through those contacts, renne was able to raise 30,000, enough for a hostile takeover. All of a sudden he was fickin to be bought out by his wife. Reporter is this not emasculating in any way . No reporter im asking him. Yeah. I didnt appreciate it, but, you know, it was growing pains. Reporter and heres where this story gets good. After his wife raised the money, rancher or any man, for that matter he put aside his ego and reconsidered a core belief. How you doing, girl . Reporter he stopped eat eating meat, liked how it felt, and now works for his wife at the rowdy girl vegan farm animal sanctuary. As best we can tell, the only cattle ranch conversion in the country. So now that hes change forward you, how would you like to change her . I cant think of a thing. Ah reporter and there is everything you need to know to stay married forever. Steve hartman, on the road, in engelton, texas. 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 access. Wgbh. Org Attention Parents before school this september all kids entering 7th and 12th grades must get the meningococcal vaccine. It protects against serious and sometimes deadly diseases like meningitis. Call your Health Care Provider today. Learn more at health. Ny. Gov immunize. Your daughter wants to stay organic. Your husband wants to stay free from artificial ingredients. You want to stay free from artificial preservatives. And your debit card wants to stay on a diet. Fill your cart with Small Victories like stop shops natures promise brand. Great prices on over 800 items. The insider counting down the biggest stories tracking today. Number one, inside hollywoods baby bump brigade. Kelly and chrissy. Im a little tired. Who will be first in the race to the delivery room. I mean i feel huge. I feel like im ready to pop. Being pregnant and in the hollywood spotlight involves a bit more scrutiny then simon cowell finally returns to tv. Has his 2yearold son softened his harsh judgment . I was. Hola. Along came dora. Number three, whos hotter . Very handsome, ben affleck is a little more rugged and weathered. Inside their duel covers for