we'll see you then. >> axelrod: campaign 2016 tonight. falling behind in wisconsin, under fire for his latest comment on abortion, donald trump refuses to rule out running as a third party candidate. >> when we meet at the convention, we'll see how we're treated. i want to see how we're treated. >> axelrod: also tonight, the exroortd new security at brussels airport. a preview of what could be coming to an airport near you. can a collar worp by humans

reduce the impact of concussions. >> so it's like bubble wrap for your brain. >> yes, exactly. >> axelrod: and when a homeless girl needed help, this very cool cop didn't skip a beat. captioning sponsored by cbs this is the "cbs evening news." >> axelrod: good evening. i'm jim axelrod. the road to the presidential nomination runs through wisconsin next tuesday with both parties holding primaries. for respects, 42 delegates are on the line, for democrats 96 delegates are at stake, including 10 superdelegates. wisconsin will not make or break any of the candidates, but a loss could signal a rockier road ahead for republican front-runner donald trump. here's julianna goldman. >> reporter: donald trump crisscrossed wisconsin today trying to rebound from one of the toughest weeks of his campaign. >> i'm not doing well because nobody knows my-- my message. >> reporter: with polls

ahead of next week's primary, he's haempling ted cruz and john kasich on trade. >> we're breathe drained of our manufacturing and our jobs. we're being drained like we're children. >> reporter: and defending himself over his shifting statements on abortion-- >> nobody has greater respect for women than donald trump. >> reporter: protecting his campaign manager who is charged with battery, and controversial foreign policy rhetoric. >> now, i didn't say anything about letting japan nuke, but i did say perhaps if we can't do the right deal, we'll have to let them take care of themselves. >> look, the bottom line is, you don't go running around talking about using nuclear weapons, period, end of story. >> reporter: wisconsin will be a critical test of the "stop trump" movement. john kasich and ted cruz hope a loss of blunt tusm's momentum and help force a contested convention in july. >> the key for us is to accumulate delegates and continue-- to be able to build momentum going into the conventions. >> if we nominate donald trump,

hillary clinton, with a big silver bow. >> reporter: in an interview for sunday's "face the nation," trump against be teased a third party bid, an outcome that would surely spell defeat for republicans in the fall. >> reporter: if there's another nominee would you tell the big follow, hey, we're all republicans. go support that nominee. >> i'll tell you when we meet at the convention. i want to see how we're treated. >> reporter: trump is promising to stay in wisconsin's through next week's primary and he also said today his wife will be on the campaign trail for the first time next week. jim air, recently cbs news poll shows trump's favorability rating is lower than any republican or democratic nominee in recent history. >> axelrod: julianna goldman, thank you. you can see the rest of john dickerson's interview with donald trump tomorrow morning on "face the nation." also on the broadcast, republican national committee chairman reince priebus. on the democratic side, the latest polls show hillary clinton trailing bernie sanders in wisconsin. for now, the candidates are

>> today's cover of the "new york daly news "shows bernie sanders calling hillary clinton a debate dodger issuing a statement saying the santers campaign needs to stop with the games. over the course of the last week, we have offered three specific dates for a debate in new york, all of which the sanders campaign rejected. the sanders camp quickly responded. "the idea that they want to debate in new york on a night of the n.c.a.a. finals with syracuse in the tournament, no less, is ludicrous. >> this is a campaign of the people, by the people, and for the people. and i'm proud of that. ( cheers and applause ) >> reporter: sanders did not address the issue during an event in wisconsin, but continued hammering at clinton. >> let me say a word about some of the differences, important differences, that exist between secretary clinton and myself on some very important issues. >> reporter: less than 200

front-runner focused on her message. >> if i tell you i'll fight for you, i'll stand with you, i'll work for you, that's exactly what i'll do. >> reporter: polls show clinton is trailing in wisconsin. a loss there would, again, highlight her inability to energize a liberal base. this sanders supporter says that could hurt the party. >> it could be a disaster, i'm afraid. the most important thing, democrats win when the voters turn out. and there is such energy around bernie that if secretary clinton gets the nomination, i'm afraid that that energy is going to dissipate. >> reporter: clinton hopes to win big during the next round of voting on the 19th, which includes new york, to secure the nomination by the end of the month. but, jim, aides acknowledge sanders probably won't feel enough political or financial pressure to crop out of the race. >> axelrod: weija jiang in our washington newsroom, thank you very much.

a mass grave in the recent recaptured city of palmyra. the city was under isis control for nearly a year until government forces took it back last week. at least 42 bodies were found. all had been executed. belgiums main airport, used by more than 20 million people each year, reopens tomorrow for the first time since 16 people were killed there nearly two weeks ago. 16 others died in a separate bombing in brussels' subway system. as jonathan vigliotti reports, the new security measures are extraordinary. >> reporter: brussels airport may technically be ready to reopen sunday, but the attack that rocked this transit hub will make getting back to business unusual. the departure hall where the two bombs exploded remain closed. for now, travelers will check in under two large temporary tents. new permanent security measures are also in place. among the additions, travelers'ers'

least twice, including before they even enter the check-in area and again while going through security at the gate. those dropping off passengers will have to do so in the parking garage. special security cameras will monitor in real-time each and ever license plate on vehicles coming and going. and police will be equipped with bulletproof vests and allowed to check vehicles at random. this extra layer of security. the increased police presence has been met with resistance. this afternoon, protesters in brussels' place de la bourse clashed with authorities who they say were handed too much power. >> they're using terrorism as it protects to implement this new security regime. >> reporter: on friday, on the other side of town, family and friends mourned the loss of a

loubna lafquiri, a mother of three, was heading to work on the metro when the second attack unfolded. police continue their manhunt for at least one attacker that got away. meanwhile, only three flights will depart from brussels airport tomorrow. all of them headed to european destinations. jim, officials say it could take several more months before the airport is fully operational. >> axelrod: jonathan, thank you. now on some nasty weather in the northeast. cold, wind, and even snow this first weekend of april. let's bring in pamela gardner from wbz-tv in boston. pamela, what are you seeing in the forecast? >> a little bit of everything over these next couple of days. we have two rounds of snow that we're tracking, the first round sunday morning, another round of snow going into monday for us here in new england. and here we any as we wee go through the hour-by-hour timing, sunday morning, 10 a.m. through that period of time, this clipper system exiting out to sea. it's a fast mover but potent

accumulation for our friends in new york, going into massachusetts, and even northern part of connecticut. and as we look ahead to sunday afternoon, the strong winds will be an issue, too. wind advisories, high-wind warnings are posted. we could be pushing 50- to 70-mile-per-hour wind gusts at times. second round of snow moves in for monday. and as we get into 7:00 a.m., all the way through the evening hours, 9:00 p.m., this clipper system moves off to sea again but packing a little bit of a bigger punch in terms of snow accumulation, 3-6 inches in the jackpot jones across central massachusetts. jim. >> axelrod: that is not a very spring-like welcome for april. thank you, pamela. this past week, the f.b.i., along with some outside help, unlocked an iphone used by one of the san bernardino terrorists. today we learned the f.b.i. has told local police departments it will help them unlock cell phones in cases where they could provide evidence. as john blackstone shows us, cracking the code is easier said that done.

launched the search for a way to unlock the san bernardino terrorists' iphones, the technicians at a california company called drivesavers were among those who took up the challenge. they have plenty of experience rescuing broken iphones. how many iphones a month do you get that you have to try to get information from? >> you know, we see, actually, anywhere from 100 to 300 iphones a month right now. >> reporter: michael cobb is drivesavers' director of engineering. >> this is the chip that holds all the data for the iphone 5c, in the encrypted form. >> reporter: so you've got that off the phone. why not just read it? >> ah, well, because encryption is not so simple to retrieve. >> reporter: a company the f.b.i. has not identified found a way around apple's encryption. the effort at drivesavers shows what they had to overcome. trite wrong password too many times, and the phone wipes its memory clean. >> in the case of the 5c, you only have 10 attempts before the the iphone gets erased. >> reporter: to make sure the

copy it, then put it in a device that simulates an iphone but lets them reset the chip's password counter to zero after every 10 attempts. wouldn't that take forever? >> it all depends on how fast you are able to pull the data off, make that copy, do your 10 attempts. >> reporter: drivesavers hasn't yet defeated apple's paps word protection, but over the past 30 years they have retrieved information from computers that have been burned, broken and deliberately smashed. >> this is actually a job that came in this morning that has a lot of corrosion on it. >> reporter: it spent some time in water. >> yes, i don't know how much time but there's a tremendousation of corrosion in here. >> reporter: while law enforcement comes looking for evidence, many are drivesavers clients are family members trying to recover the messages and photographs of loved ones who have died, leaving behind their phone but not their password. john blackstone, cbs news, novato, california.

the third time in a row, the aerospace company blue origin successfully launched a rocket into space and landed it safely back on earth. add julianna jericka duncan reports, this is another small step for a giant leap for commercial spacelight. >> reporter: the rocket took off from west texas today and returned to earth, unmanned and upright. it was the rocket's third successful test flight since november. blue origin owner and amazon founder jeff bezos confirmed the touchdown on twitter this afternoon. cbs news space consultant bill harwood. >> with one or even two test flights you kind of take a wait-and-see it'situde but with three naa row it's becoming apparent that blue origin has a maturing technology that they're very confidential will be able to carry people into space in the next two years. >> reporter: richard branson's virgin galactic attempted a similar mission in the fall of 2013, but seconds into the launch, the rocket broke up in

the copilot was killed, and the pilot was seriously injured. for several years, companies like blue origin have been working on commercial space flight with hopes of making these trips as easy as airplane rides. well-known spacex, founded by elon musk, made history when it delivered cargo to the international space station in 2012. spacex has had three failed landings but their missions were more complex than blue origin's. >> it seemed to me blue origin clearly has the lead here in the getting to space first for commercial space tourism. >> reporter: blue origin has yet to reveal how much it will cost to travel to space. virgin exwhractic says it plans to charge at least $250,000 per person. and, jim, already 700 people have paid deposits. >> axelrod: jericka, thank you. coming up, the deadly collision between a car and a plane. and the device designed to

inspired by bird brains when the cbs evening news continues. what if one sit-up could prevent heart disease? one. wishful thinking, right? but there is one step you can take to help prevent another serious disease. pneumococcal pneumonia. if you are 50 or older, one dose of the prevnar 13 vaccine can help protect you from pneumococcal pneumonia, an illness that can cause coughing, chest pain, difficulty breathing, and may even put you in the hospital. even if you have already been vaccinated with another pneumonia vaccine, prevnar 13 may help provide additional protection. prevnar 13 is used in adults 50 and older to help prevent infections from 13 strains of the bacteria that cause pneumococcal pneumonia. you should not receive prevnar 13 if you have had a severe allergic reaction to the vaccine or its ingredients. if you have a weakened immune system, you may have a lower response to the vaccine. common side effects were pain, redness or swelling at the injection site, limited arm movement, fatigue, headache, muscle or joint pain, less appetite, chills, or rash. get this one done.

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>> axelrod: one of the doctors who first publicized the dangers of concussion in the nfl has turned his attention to a vice dwoois in lessening their impact. it's inspired by a small and very resilient type of bird. >> i am dying in here! i'm dying in here! >> reporter: the movie "concussion" highlights the long-term consequences of brain damage from football. in the film, alec baldwin plays real-life neurosurgeon julian bailes. >> we realized years ago, a decade ago, that helmets weren't the answer. helmets weren't working. >> reporter: why? helmets can't protect the brain from slosh, when the brain slams against the skull. bailes and his partners were inspired by the woodpecker. it slams its head more than 80

without concussion. the bird's long tongue wraps around its head, compressing the jugular vain. bailes replicated that with a collar for humans that gently pressing the jugular vain like a necktie, reducing bloodflow out of the brain. that creates a backflow, about a tea sponextra, making a tighter fit in the skull. so it's like bubble wrap for your brain. >> yes, exactly. >> reporter: what's the downside to increasing the volume of blood inside the skull? >> there's none that we know of. >>.this is such a novel device, the question we get from parents, "is it safe for my child." >> independent investigator gregory myer is leading a study. >> we didn't find any negative responses so that gave us some confidence that this is safe. but we have to take this to the playing field to really be sure about that. >> reporter: researchers equipped high school players and found 1,000 routine head impacts in one season. are you saying that there is

are changes to the brain, even without traumatic brain injury? >> yes. so that's a very important point. make it's those repetitive hits that we really need to focus on and protect against. >> reporter: researchers will publish the m.r.i. results this month. they show a dramatic difference in the high school athletes not wearing the collar. the red shows changes to the brain over the season-- compared to the players wearing the collar. >> it's unbelievable. to be honest, we're look at this and we're expecting to find nothing. >> reporter: this research could change not just protective gear in sports-- >> it's a paradigm shift where we change the way we study protecting the brain. this is a game changer. >> reporter: the collar's not yet for sale. a performance sports group, which makes athletic equipment, has licensed the technology and is applying to the f.d.a. for approval. it's hoping to bring the collar to the market in the next year or two. now, it's still early, there are skeptics but this really has the potential, jim, to change the

protecting the brain from injury. >> axelrod: bubble wrap for the brain. really interesting. thanks, contessa. up next, which way do the bad

the human arrow point the way. . >> axelrod: in southern california today, an airplane crash-landed on a car. one person in the car was killed. five others were injured. this all happened about 50 miles north of san diego.

investigation. the will he or won't he involving tiger woods playing at the masters next week has now been settled. he won't. the four-time champion says he's still in too much pain from his recent back surgeries. he will attend, but only as a spectator. police looking for robbery suspects in surrey, england, got some unexpected help. they released this video yesterday of a group of quick-thinking children on an easter egg hunt. the kids formed a human arrow pointing to where the suspects were hiding. a police chopper saw it from above, and the men were quickly captured. still ahead, when a homeless girl needed help, this cop hopped into action. it helps keep my skin clearer. with only 4 doses a year after 2 starter doses... ...stelara helps me be in season. stelara may lower your ability to fight infections and increase your risk of infections.

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oral decongestant. it starts working in as little as 30 minutes. so you can get back to living the good life. live claritin clear,with claritin-d. with some excellent police work. as carter evans shows us, it's not about crime fighting. it's about compassion and a pretty impressive sense of balance. >> reporter: huntington beach police officers zach pricer is an imposing force. he's a member of the swat team, a mixed martial artist, and, apparently, a pretty good hopscotch player. you looked like you were into it. >> well, if i'm not into it how is she going to be into it, you know?

11-year-old homeless girl living with her mom in a van in a local park. it was reported to police as a suspicious vehicle. you've got kids. >> yes. >> reporter: what's it like to see a little girl living in a van? >> heartbreaking. >> reporter: it was officer pricer's job to make sure she was okay. >> in order for me to do that i have to get her to talk to me. i have to get her to trust me. it's not a easy for a child of any age to look up to scary looking me and be comfortable. >> reporter: officer pricer thought a game of hopscotch might help break the ice. it was a tender moment that was also meant to be a distraction. according to officer joel petersen who recorded the video. >> it was at a time when the mom was sharing intimate details about their circumstances, and oftentimes, just our presence can be kind of traumatic for little ones, and we don't want to associate police officers with seeing mom cry. >> reporter: when the huntington beach police department posted videotape on its facebook page earlier this week, the response was overwhelming.

>> yes. yes. >> reporter: well over a million people have watched this now. >> it's a good thing. if it takes me looking like an oaf, trying to play hopscotch to shine a positive light on law enforcement and all my brothers and sisters all over the nation, then i'll take the heat. >> reporter: and that heat is warming hearts. carter evans, cbs news, huntington beach, california. >> axelrod: and that's the cbs evening news for tonight. later on cbs, "48 hours." i'm jim axelrod in new york, and for all of us here at cbs news, thanks for joining us, and good night. captioning sponsored by cbs

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