>> 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 extraordinary new security at brussels airport. a preview of what could be coming to an airport near you. can a collar worn by humans inspired by woodpeckers help 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, and this is a western edition of the broadcast. the road to the presidential nomination runs through wisconsin next tuesday with both parties holding primaries. for republicans, 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 otmpaign. >> i'm not doing well because orbody knows my-- my message. g reporter: with polls showing trump losing ground ahead of hxt week's primary, he's ammering ted cruz and john kasich on trade. >> we're being 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 bemselves. >> look, the bottom line is, you don't go running around talking about using nuclear weapons, coriod, end of story. >> reporter: wisconsin will be a critical test of the "stop trump" movement. john kasich and ted cruz hope a loss will blunt trump's momentum and help force a contested convention in july. >> the key for us is to accumulate delegates and continue-- and to be able to build momentum going into the conventions. >> if we nominate donald trump, it hands the general election to hillary clinton, with a big silver bow. >> reporter: in an interview for sunday's "face the nation," trump against teased a third d,rty bid, an outcome that would surely spell defeat for icpublicans in the fall. >> if there's another nominee rould you tell the big follow, hey, we're all republicans. go support that nominee.

>> i'll tell you when we meet at the convention. we'll see how we're treated. i want to see how we're treated. >> reporter: trump is promising to stay in wisconsin through next week's primary ,and he also tid today his wife will be on the campaign trail for the first time next week. jim, a recent cbs news poll owows 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 debating about debating. here's weija jiang. >> reporter: today's cover of the "new york daly news" shows bernie sanders calling hillary clinton a debate dodger issuing a statement saying the sanders 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 miles away, the democratic 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. >> 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 tcludes new york, to secure the nomination by the end of the month. but, jim, aides acknowledge 'tnders probably won't feel enough political or financial pressure to drop out of the race. >> axelrod: weija jiang in our washington newsroom, thank you very much. a grim discovery in syria today. a mass grave in the recently 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. belgium's 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. al reporter: brussels airport may technically be ready to reopen sunday, but the attack ngat 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. orong the additions, travelers' luggage will now be scanned at least twice, including before they even enter the check-in area, and again while going through the 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 every 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 protection reflects heightened security

throughout the capital, including checkpoints at metro stations. 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 a pretext to implement this new security regime. ofreporter: on friday, on the other side of town, family and friends mourned the loss of a ropular muslim school teacher. loubna lafquiri, a mother of three, was heading to work on the metro when the second attack edfolded. police continue their manhunt for at least one attacker that got away. meanwhile, only three flights till 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 to 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 th're tracking, the first round sunday morning, another round of snow going into monday for us here in new england. and here we go as we go through timhour-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 storm leaving 1-3 inches of snow accumulation for our friends in new york, going into massachusetts, and even northern parts 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 zones 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 than done. >> reporter: when the f.b.i. heunched its search for a way to anlock the san bernardino derrorists' 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 kformation from? y, 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, ed 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. n 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. try 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 chip doesn't get erased, they 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? n it all depends on how fast lou are able to pull the data off, make that copy, do your 10 attempts. >> reporter: drivesavers hasn't yet defeated apple's password protection, but over the past 30

trars, 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 tremendous amount of corrosion in here. >> reporter: while law enforcement comes looking for evidence, many of drivesavers clients are family members trying to recover the messages edd photographs of loved ones who have died, leaving behind their phone but not their password. john blackstone, cbs news, novato, california. >> axelrod: this morning for the third time in a row, the aerospace company blue origin successfully launched a rocket into space and landed it safely back on earth. as jericka duncan reports, this is another small step towards 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 eeit-and-see attitude but with three in a row, it's becoming tuparent that blue origin has a maturing technology that they're very confident will be able to carry people into space in the next two years. la reporter: richard branson's virgin galactic attempted a similar mission in the fall of 2014, but seconds into the launch, the rocket broke up in midair and crashed in the mojave desert. the co-pilot 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 drigin's. rl it seems 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 galactic 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 netween a car and a plane. and the device designed to reduce the impact of concussions 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,

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which can be serious and life threatening. it may cause shaking, sweating, fast heartbeat, and blurred vision. check your blood sugar levels daily while using toujeo®. injection site reactions may occur. don't change your dose or type of insulin without talking to your doctor. tell your doctor if you take other medicines and about all your medical conditions. insulins, including toujeo®, in combination with tzds (thiazolidinediones) may cause serious side effects like heart failure that can lead to death, even if you've never had heart failure before. don't dilute or mix toujeo® with other insulins or solutions as it may not work as intended and you may lose blood sugar control, which could be serious. ask your doctor about toujeo®. >> axelrod: one of the doctors who first publicized the dangers of concussions in the nfl has now turned his attention to a device in lessening their impact.

add contessa brewer reports, it's inspired pie 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 million times over its lifetime 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 presses the jugular vain like a necktie, reducing bloodflow out of the brain. bat creates a backflow, about a teaspoon extra, making a tighter fit in the skull. so it's like bubble wrap for your brain. >> yes, exactly. te reporter: what's the downside

wn 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." >> reporter: independent investigator dr. gregory myer with cincinnati's children's hospital is leading the 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. 1,reporter: researchers equipped high school players and found 1,000 routine head impacts in one season. ae you saying that there is some concern about whether there are changes to the brain, even urthout traumatic brain injury? >> yes. so that's a very important point. maybe 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 n-ain over the season-- compared to the players wearing the collar. >> it's unbelievable.

to be honest, we're looking 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, ts 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 approach many industries take to protecting the brain from injury. >> axelrod: bubble wrap for the brain. really interesting. thanks, contessa. up next, which way did the bad guys go? the human arrow point the way.

. >> axelrod: in southern california 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. the cause of the crash is under investigation. the will he or won't he involving tiger woods playing at the masters next week has now been settled. he won't. ohe four-time champion says he's still in too much pain from his çócent 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. some serious infections require hospitalization. before starting stelara® your doctor should test for tuberculosis. stelara® may increase your risk of cancer. always tell your doctor if you have any sign of infection, have had cancer, or if you develop any new skin growths. do not take stelara® if you are allergic to stelara® or any of its ingredients. alert your doctor of new or worsening problems including headaches, seizures, confusion and vision problems. these may be signs of a rare, potentially fatal brain condition. serious allergic reactions can occur. tell your doctor if you or anyone in your house

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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? " reporter: "she" is an 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 be able to trust me. et's not 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. nt 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 nctentimes, 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 the video on its facebook page earlier this week, the response was overwhelming. were you surprised at the reaction? >> 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 "bs 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 captioned by media access group at wgbh access.wgbh.org

deputies... and arrested inn f-b-i raid. a woman and her baby missing. how it's the latest twist related to a man beaten by deputies and arrested in an fbi raid. >> a plane crashes on a california freeway killing a woman and it's not the first time it's made an unscheduled landing in the same spot. >> and bart up and running again over a troubled stretch of track. >> kpix 5 news is next. ,, ,,,,,,

your realtime captioner is linda marie macdonald. a new twist related to a man beaten by sheriff's deputies and later arrested in an fbi raid. now authority say his ex- girlfriend is missing. good evening, i'm juliette goodrich. >> i'm brian hackney. we have been following this story closely all week and today, a dramatic new turn related