With one more look at you. Then the powerful encore. Number one in just 60 its dat bate pitting the fbi over apple. On why he is refusing to help the feds break into the phone used by the San Bernardino gunman. World news tonight anchor david muir also gets cook to respond to calls by donald trump for an apple boycott. As we sit here you know some of the families of the victims in San Bernardino have now come out in support of the judges order that apple help the fbi unlock that iphone. One family reportedly saying, were angry and confused as to why apple is refusing to do this. What would you say to those families tonight . They have our deepest sympathy. What theyve been through, no one should have to go through. Apple has cooperated with the fbi fully in this case. They came to us and asked us for all the iormation we had on this phone. And we gave everything that we had. But this case is not about one phone. This case is about the future. What is at stake here is can the software that we believe would make hundreds of millions of customers vulnerable around the world, including the u. S. . And youd have to write that system in order to unlock that phone . Yes. The only way we know would be to write a piece of software that we view as sort of the software equivalent of cancer. We think its bad news to write. We would never write it. We have never written it. And that is what is at stake here. The fbi though says it believes syed faruk used that phone to communicate with his wife, his accomplice. Do youuggle at all with the possibility there could be information on that phone that could reveal other plots, other people involved in planning the San Bernardino attack . David, if we knew a way to get the information on the phone that we havent already given, if we knew a way to do this that would not expose hundreds of millions of other peoples issues, we would obviously do it. Director james comey said. He said its not about a slippery slope, its about 14 people who were slaughtered and many more had their lives ruined. Maybe the phone holds the clue to finding more terrorists, maybe it doesnt. But we cant look the survivors in the eye and ourselves if we dont follow any possible lead out there. Do you understand where hes coming from . I do understand where hes coming from. And this is an incredibly complex issue. But it is about the future. Think about this. If a Court Compels apple to write this piece of soware, to place a back door in the iphone, we believe it does put hundreds of millions of customers at risk. Reporter we asked tim cook to explain this new system they would have to create to break into the iphone. The pass cord on the front like we all use to get into our iphones. After a certain number of tries it autoerases . What they want is they want system that takes out the security precautions, then they want a ability to go through a number of passwords at the speed of a modern computer. A computer would do that . A computer would do that. That is what theyre asking for. We believe that is a very dangerous operating system. You hear that from the republican frontrunner, donald trump what i think you ought to do is boycott apple until such time number. Saying boycott apple . The best thing is americas strongest when we all come together. Together . You know, i think a democracy is messy sometimes. But this i love democracy. That is who we are vinita nair. I think the best thing to do is to discuss and collaborate and Work Together on whatever the solution may be. Let me ask you this. Before. The stories are legendary about over them, locked doors, secrecy. Any American Company can keep a secret, its apple. To those who might say, why didnt the fbi and apple team up far earlier in one of those secret labs and get this done and no one would have had to know about it . I cant talk about the tactics of the fbi. Theyve chosen what theyve done. Theyve chosen to do this out in the public. For whatever reasons that they have. What we think at this point, given it is out in the public, is that we need to stand tall and stand tall on principle. Theres probably more information about you on your phone than there is in your house. Our smartphones are loaded with our intimate conversations, our financial data, our health records. Theyre also load with the location of our kids, in many cases. So its not just about privacy, but its also about public safety. If you didnt think this would set a precedent, if you didnt believe this would be a something your engineers could do and how quickly could they do it . Weve never donee it before so i dont know how long it would take. Would i do it . In a Perfect World where none of the implications that im talking about exist . Yes, we would do it. We would obviously do it. But we dont live in a Perfect World. In your quiet moments, do you have any concern about you might be able to prevent a terrorist attack by breaking into that phone . David, some things are hard. And some things are right. And some things are both. This is one of those things. N this case, you believe there are somehings that just should never be created . Correct. Reporter today steve jobs would have turned 61. Cook says not a day goes by that he doesnt think about his iconic predecessor. Have you thought about what he would have done in this situation . Thought was righ loved what america was founded on so much and would do nothing to put all these customers at risk. Hed be doing the same thing. Reporter tim cookkells us they talked to the fbi early on, giving them advice, he says, on other ways to best get information from that iphone, to plug it in, to back it up to the icloud. Did they do that . Unfortunately, in the days, early days of the investigation, fbi directed the county to reset the icloud password. When that is done, the phone will no longer back up to the cloud. And so i wish they would have contact the us earlier so that that would not have been the case. How crucial was that missed opportunity . Very crucial. The white house said this week that the fbis request is limited in scope. Limited in scope, do you agree with that . And have you talked to the president on this . I have not talked to the president. I will talk to the president. Do i think its limited . No. You have talked to the president before on these issues are you disappointed there wasnt more of a dialogue with the administration before this swift action from the Justice Department . Yes. You wish there was more done . Yes. I think there should have been. This filing we found out about the filing from the press. Reporter apple must respond to the court order by friday. Im curious, tim. Did you ever think that youd find yourself at the center of such a crucial National Debate . No. This is not a position that we would like to be in. It is a very uncomfortable position. To oppose your government on something doesnt feel good. And to oppose it on something where we are advocating for civil liberties, which they are supposed to protect, it is incredibly ironic. David, thank you for that exclusive report. In response to our interview tonight a Government Official is apple to be the only one who knows how they develop a new way into their phones, that the fbi doesnt want or need to know that secret. The debate continues. Up next on nightline, the woman at the center of a sensational case takes the stand. Did Dalia Dippolito high to hire a hit man to hill her husband . Celine dion singing all by hers in her first vegas concert since losing h h husband. All by myself dont want to be all by myself anymore what if we did for mortgages what the internet did for buying music and plane tickets and shoes . You would turn an intimidating process into an easy one. You could get a mortgage on your phone. And if it could be that easy, wouldnt more people buy homes . And wouldnt those buyers nene to fill their homes with lamps and blenders and sectional couches with handlathed wooden legs . Opportunities for wooden leg makers . And wouldnt those new leg makers own phones from which they could quickly and easily secure mortgages of their own, further stoking demand for necessary Household Goods as our tidal wave of ownership floods the country with new homeowners, who now must own other things and isnt that the power of america itself now shrunk to fit the hands of a child, or, more helpfully, a homebuying adult. Anyway. Thats what we were thinking. With my moderate to severe ulcerative colitis, the possibility of a flare was almost always on my mind. Thinking about what to avoid, where to go. And how to deal with my uc. To me, that was normal. Until i talked to my doctor. She told me helps people like me get uc under control and keep it under control when certain medications havent worked well enough. Fight infections, including tuberculosis. Serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. Before treatment, get teteed for tb. Tell your doctor if youve been to areas wherer certain fungal infections are common, and if youve had tb, hepatitis b, are prone to infections, or have flulike symptoms or sores. Dont start humira if you have an infection. Raise your expectations. Ask your gastroenterologist about humira. It is the alleged murder for hire case that made national headlines. Tonight the woman at the center of it, Dalia Dippolito, takes the stand with an unusual defense. Heres abc ace linsey davis. Im positive, like 5,000 sure. Reporter Dalia Dippolito, e woman caught on tape saying she wawa5,000 surehe wanted a hit man to hill her husband, was back in court yesterday. Taking the stand for the First Time Since herrrest in 2009 ander convictio in 2011 i have been accused of something that i didnt. Reporter trying to explain away that incriminating video. Her explanation . She was simply acting. This is supposed to be something you guys are going to put online so you can get publicicy . On social media, right. So he can try to get an acting job from it. Reporter dalia says it was part of a plan she hatched with her then husband michael get famous. This is acting . Yeah. Reporter prosecutors say that was no act. And allege she promised to pay this undercover cop posing as a hit man to kill her husband of x months. Shehe parked the third space from here. You know, he gets two in the head. Reporter her now exhusband Mike Dippolito said he couldnt wait to see what she said in court. Let me know, ill be sitting in the back with popcorn. Walking on the sidewalk, this doesnt happen very often. No, it doesnt happen at all. Reporter in an exclusive pretrial interview with 20 20 this past december Dalia Dippolito said shes who is Dalia Dippolito . Compassionate. Because of that reporter at the time her newly hired highpowered sttorneys wouldnt let her talk about certain parts of the case, particularly those seemingly damning videotapes, because shes now facing a new trial overturned on a technicality. But yesterday there was no avoiding them. Shes forced to watch that again. 5,000 percent susu. Thats all mohammad told you to say, right . Yes, he told me to say that. 5,000 sure . I needed to project and yeah. But thats what he told me, to make it look believable. Reporter perhaps the most surreal moment in the courtroom, when the prosecutor plays an audiotape of her trying to explain to her thenhusband mike that she actually didnt pay to have him killed. Please, i need ann attorney, can you help me . Its not true. You said you wanted to have me killed, i heard that. Its not true, that is not true reporter according to her, mike was in on the performance from the beginning. So why, asks the prosecutor, is she trying so hard to convince him . Part of a script. How could that not be true . Reporter her attorney, brian innocent victim of a famehungry Police Department. Thissase is about a Police Department that tossed her under the bus for purposes of getting fame on a cops tv show. Reporter the nowinfamous moment when police staged a fake crime scene and told Dalia Dippolito her husband was dead. Is your husband michael . Im sorry to tell you, maam, hes been killed. This special edition of cops is filmed on location reporter he says its all part of the plan so be on the Reality Tv Show cops when mohammad came to them with the story about a beautiful woman wanting to have her husband killed. What the Police Department did is found out shes an attractive woman, in their minds theyre like ching ching ching, this is a perfect skit to get on tape. Reporter not long after filming the exchange between the police and dalia, the police why did you go back to the Police Department and immediately post, on youtube, a video of the staged crime scene of Dalia Dippolito . Well, we posted it as part of our entire plan of publicizing the arrest in this case. You agree with me theres still a pending investigati on Dalia Dippolito and youou posted theoutube video, right . Yes. Reporter dalias Attorney Says it adds up to only one conclusion, she was framed. Theres no question about it, that the boynt beach Police Department was dead set on manufacturing a crime here. Reporter abc news senior Legal Correspondent sunny hostin says that remains to be seen. Is this a case of entrapment . Do i think that the Police Officers couou have done better . Yes. And you certainly dont as the Police Spokesperson upload that video to youtube. Is that a case killer . No. It isnt. Im wrong, but for police toie on camera and create a crime scene, make this elaborate circumstance to say, oh, your husbsbds dead, when he really isnt. That is unusual but not unheard of. I have t t tell you that sting operations happen all the time. Reporter the Boynton BeachPolice Department stands behind their investigation telling abc news the cops show happened to be here at the time of this investigation are were not in the business of producing television. Were in business of saving lives and we believe we did that in this case. Reporter yesterday issuing a statement, we trust in our state attorney to successfully prosecute this case and we are confident we have given his office sufficient evidence to meet the states burden. Still, dalias attorneys filed a motion to dismiss the case based on evidence of what they say is police misconduct. If the case isnt dismissed a new trial is set to start this spring. And theres one person who says i am 5,000 sure she tried to kill me. Reporter for nightline im linsey davis in new york. Thanks to linsey davis. You may have noticed sunny hostin providing legal analysis during that report. We would like to welcome her to abc news. Shes joining us as senior Legal Correspondent and analyst. Up next here, celine dion singing all by myself for the First Time Since the death of her husbanan dont want to be all by myself dad, you can just drop me off right here. Oh no, ill take you up to the front of the school. Thats where your friends are. Seriously, its, its really fine. You dont want to be seen with your dad . No, its. No. Oh, theres tracy. What [ horn honking ] [ forward collision warning ] bye dad it brakes when you dont. The newly redesigned volkswagen passat. Right now you can get a 1,000 president s day bonus passat, jetta, or tiguan models. Red lobsters lobsterfest is back. So come try the largest variety of lobster dishes of the year, like lobster lovers dream or new dueling lobster tails. Its a party on every plate, and youre invited. Celine dion took the stage for the First Time Since the death of her husband . Heres abcs Deborah Roberts. Reporter last night celine dion making an emotional return to the stage of the coliseum in las vegas. With one m me lookk at you reporter perfofoing with one more look at you, a poignant tribute to her late husband and manager rene angelil. Every time i close my eyes, i felt rene on stage with me. Hes always been on stage with me. And nothing will ever change that. Reporter its been just a month since she lost her belovov husband to thrhrt cancer. But there was never a question dion would return. My career was in a way his masterpiece. Unfinished would hurt him all by myself reporter a heartbreaking moment when dion broke into tears singing all bymyself. Pausing to collect herself before powerfully finishing the set. I met dion last spring and though angelil was ill, he joined us on that very stage. Despite it all, encouraging his wife to perform. Sometimes, and i think im used to it, dont feel what you need to feel. Just do it. Go on stage . I did. Because i love him. And i did. And it was very hard. Reporter now as a tribute to that love, celine singing once again. For nightline, im Deborah Roberts in new york. Our thanks to Deborah Roberts for that report. Our thanks to you for watching. Were online 24 7 on our Nightline Facebook page and at abcnews. Com. Thanks again for watching and od night. 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