this is "nightline." tonight, firing line. the billionaire stirring the debate stage for the first time. >> i know how to take on an arrogant con man like donald trump. >> facing down his competition. >> i'd like to talk about who we're run being against, a billionaire who calls women fat broads and horse-faced lesbians, and no, i'm not talking about donald trump, i'm talking about mayor bloomberg. >> and the anti-millionaire front runner. >> we are sick and tired of billionaires like mr. bloomberg. >> why some of his supporters are facing scrutiny.

plus, no time to die for billie eilish. the breakout singer sweeping the grammy's, now the youngest artist ever to perform a james bond theme song. >> i am literally living the exact life i would have a dream about. >> how she plans to take down bad guys. but first, the "nightline" five.

i thougin that moment. illiant we have not said one word tonight about race. not one word. are you kidding me? the heart and soul of this party is diversity. when a kid succeeds in columbia, south carolina - in las vegas, nevada - that is a triumph for every american. people don't know tom steyer. i've known tom steyer for fifteen years. his commitment on racial justice and social justice is rock solid. i'm tom steyer and i approve this message.

good evening. thank you for joining us. the new face to face off on the debate stage. voters getting a first glimpse of how michael bloomberg holds up on the debate stage. already spending millions and rising in the polls, but hoping to find a foothold in the race for the white house. so how did he do? we go to rick klein. >> any swagger that mike bloomberg might have had coming into the debate faded on his wealth, on treatment of women. yes, he defended himself, fwhu is but this is by far the spiciest debate. senator sanders looks like he has the most to go forward. byron? >> thank you, rick. we turn to david wright, on the

highlights, with the front runner facing heat from some of his supporters, accused of bad behavior. >> reporter: tonight in las vegas, a new contender right in the line of fire. >> democrats take a huge risk if we just substitute one arrogant billionaire for another. >> i don't think you look at donald trump and say we need someone richer in the white house. >> reporter: for the first time, billionaire businessman mike bloomberg was on stage at this nbc debate, dodging the incoming. >> the mayor says he has a great record. he has not managed his city i have, very well when he was there. >> reporter: bloomberg has been rising in the polls, having spent more than $400 million of his own money mostly on advertising. that makes him a formidable player. >> they've been sit being out here for ten months, 12 months, raising money, going to caucuses, and all of a sudden he wants to drop in.

>> i know how to take on an arrogant con man who comes from new york. >> billionaires today, if you can believe it, have an effective tax rate lower than the middle class. so maybe just -- >> tax code. why are you complaining? who wrote the code? you and your -- >> you did, you and your campaign. >> you and your 99 senators. >> not me! >> he has to prove himself. welcome to the nba. he'll get that treatment. >> in this is ridiculous. we're not going to throw out capitalism. other countries tried that. it was called communism and it just didn't work. >> reporter: elizabeth warren going on offense. >> mayor buttigieg really has a slogan that was thought up by his consultants to paper over a thin version of a plan that would leave millions of people unable to afford their health care. it's not a plan. it's a power point.

and amy's plan is even less. it's like a post-it note. >> more microsoft word guy. >> i take personal offense since post-it notes were invented in my state. >> reporter: amy klobuchar and buttigieg went out it. >> you have to own those votes, especially when it comes to immigration. >> i wish everyone was as perfect as you, pete. >> reporter: democrats have yet to settle on a moderate candidate in a crowded field. >> i think michael bloomberg is the main beneficiary of joe biden's fall and benefitted from the fact that buttigieg and klobuchar have stagnated and settled somehow on bloomberg but not solidly. >> reporter: the billionaire's debut comes as the anti-billionaire bernie sanders seems to be locking down the race. both 78 years old, both taking heat tonight. >> we shouldn't have to choose between one candidate who wants to burn this party down and

another candidate who wants to buy this party out. >> reporter: the vermont senator came into tonight's debate as the undeniable front run iner, , having won the most votes in new hampshire. sanders leads the field by double digits. sanders built a movement during the 2016 campaign, railing against the billionaire class. >> our goal must be a financial system and an economy that works for all of our people. >> reporter: but he consistently draws fire for being too fringe. some of his supporters do, too. just this weekend, a bernie supporter got into a fight at a colorado rally. the altercation captured on camera by cbs's denver affiliate. >> there's a whole series of bernie supporters, called bernie bros, who seem to cross the

line. >> the bernie sanders campaign hates the term bernie bro. they see it as a vestige of 2016. >> reporter: meghan mccain pressed alexandria ocasio-cortez. >> the one thing that connect women on left and the right is the abuse subjected to by bernie brothers. it is the most sexist, the most harmful. >> to a certain extent we have to always reject hate, reject vitt roll. we also know the amount of anonymous activity that happens on the internet, and that simply is difficult to control. >> to see calling names, threats. you know, like physically we cannot work anymore. >> reporter: kline has been on the receiving end of some of those attacks.

she's the secretary-treasure of the culinary union which did not endorse a candidate this year. that decision plus blunt criticism of medicare for all outraged some sanders supporters who let loose in a very personal way. >> they have so many tweets, my daughter sent me three last night, and i said to her, don't worry about it. we're going to be fine. >> reporter: tonight senator sanders responded. >> if there are a few people who make ugly remarks who attack trade union leaders i disown those people. they are not part of our movement. >> reporter: tonight the debate at times was raw, especially with bloomberg there on the stage. >> you weren't a fan of obamacare? >> i am a fan of obamacare. at the beginning -- >> mr. mayor. >> i was there. let me finish, thank you. >> reporter: bloomberg not only has deep pockets, he also has crossover appeal, having served

as the republican mayor of new york. >> he says that he has the resources able to take on president trump, but also the temperament to do so. he's witty on social media. his team is creative. and so, with his executive experience in new york and all of that money he's been able to attract a lot of people to his campaign. >> i'd like to talk about who we're running against, a billionaire who calls women fat broads and horse-faced lesbians. and no, i'm not talking about donald trump. i'm talking about mayor bloomberg. >> reporter: he's faced accusations of sexism for what some have described as a corporate culture hostile to women. he's refused to release female executives from non-disclosure agreements in lawsuits they've filed against his company. >> are you willing to release all those women from those non-disclosure agreements so we can hear their side of the story? >> we have a very few

non-disclosure agreements. >> how many is that? >> let me finish. >> how many is that? >> none of them accuse me of doing anything other than maybe they didn't like a joke i told. and let me just, and let me, there's agreements between two parties that wanted to keep it quiet, and that's up to them. >> reporter: bloomberg's also haunted by his long-time support of the nypd stop and frisk policy which targeted minorities. but as he prepared to run for president he apologized for stop and frisk. >> i was wrong. >> reporter: tonight the issue was still front and center. >> stop and frisk which went after after can american and latino people in an outrageous way. >> the one thing that i'm really worried about, embarrassed about, was thousahow it turned with stop and frisk. >> the democratic voters i talked to say they use these debates as basically a gut check. we'll see in the coming weeks if voters say they could picture

mayor bloomberg standing next to president trump in the fall. >> reporter: tonight president trump offered hints as to who he sees as the biggest threats at a campaign rally 300 miles agray las vegas. he took aim at bloomberg. >> i hear he's getting pounded tonight. you know he's in a debate. >> reporter: and sanders. >> the dnc is going to take it away from bernie again. and that's okay. we don't care who the hell it is, we're going to win. >> reporter: tonight's debate and saturday's caucuses may help to decide who does face him. i'm david wright for "nightline." >> our thanks to david. up next, how billie eilish is taking down the bad guys in her newest achievement. ♪ i'm the bad guy ♪ duh ♪ things i did and wondering if that was the last time i was going to do that thing. coming to cancer treatment centers of america,

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usaa try to win by attacking, now, we know the trump strategy- distorting, dividing. mr. president: it. won't. work. the democrat trump fears most. as president, universal healthcare that lets people keep their coverage if they like it. a record on job creation. a doable plan to combat climate change. i led a complex, diverse city through 9-11 and i have common sense plans to move america away from chaos to progress! i'm mike bloomberg and i approve this message.

eilish, billie eilish, is shaking up the music industry, first sweeping the grammys. now her latest achievement, lending her ethereal vocals to a james bond film, the youngest artist to ever do so. so how's she do it? will reeve sat down with the breakout star. >> reporter: the song of the year, "bad guy" by billie eilish. ♪ i'm the bad guy >> reporter: with almost 800 million view the on youtube. >> i literally am living the exact life that i would have a dream about. that would be like the best

treatme dream could you possibly think of. >> reporter: the 18-year-old pop star has arrived. she's performed live at the oscars and the grammy ♪ >> reporter: where she won five awards of her own, becoming the youngest solo artist ever to win album of the year, along with her brother phineas, who is her creative partner and producer. >> we stand up here confused and grateful. >> thank you. >> reporter: the two have become one of the hottest teams in music. so what does it feel like when you're winning the biggest awards of the night on your debut album? >> that we made in his bedroom in our childhood home. it was crazy. >> reporter: now their latest accomplishment, writing the theme song for the next bond movie "no time to die." ♪ there ate just no time to die ♪

>> reporter: making billie the youngest artist ever to write the of sound track for the franchise. >> i don't know if it's going to be good or not, then we got that melody and it was just there, done. >> reporter: they collaborated with hans zimmer who is scoring the rest of the movie. >> i just loved it from the moment i heard it. just got under my skin and stayed there. >> i'm honored to be allowed into that relationship for a moment. you know. i think we did good. >> reporter: billie and phineas haven abo have been making together since they were kids. >> i had time to focus on things i wanted to focus on. >> reporter: detailed in a documentary by apple music the two grew up home schooled in a home of actors and musicians. >> it allowed them to have this creative life.

>> reporter: how does one relationship inform the other? >> our friendship and siblingship is exactly the same as our professional relationship. we don't really turn on a business switch. >> i feel a great sense of satisfaction when billie feels close enough to say, i don't like that at all. >> reporter: they caught the ear of industry executives and the pair began releasing songs in 2016. her breakout track "ocean eyes" garnered 200 million views on youtube when she was just 14 years old. since then, they've become a hit machine, from "you should see me in a crown" to the dreamy "everything i wanted." billie's style is as distinctive as her sound, known for pushing the envelope with her avant-garde looks. what goes through your mind when

you see that? >> how long the shoots were. dude, "vogue"? i don't know. life is crazy. this is insane. >> reporter: with her career taking off at a whirlwind peaac over the last year, it's easy to forget she's still a teenager. >> i'm 18. my life is so professional. after a certain amount of hours i turn into a teenager. >> reporter: her own idol, justin bieber offered support for billie in an interview with apple music. >> i just want to protect her, you know? i don't want her to, you know, go do anything i wouldn't do. i don't wish that upon anybody. so, yeah. if she ever needs me, i'm just a call away. >> reporter: how did it make you feel to see him speak about new that way? >> dude, you can't even imagine. i don't think he understands how big of a deal that is, and, you know, just him breaking down,

saying that he wants to protect me is like the craziest thing ever. >> reporter: another childhood dream, writing that 007 theme song. ♪ >> it's literally been something that phineas and i have wanted to do for years. >> it was always a dream of ours, we always wanted to do it. but i thought maybe in our 30s or 40s. >> reporter: that's decades away, guys. you're young. >> exactly. that's what i thought. fingers crossed, maybe someday. >> reporter: the brother and sister joining a pantheon of greats. like madonna's "die another day." to adele's "sky fall", and sam smith's "writing's on the wall." those who do it tend to be celebrated for it. sam smith and adele each have won oscars for their title songs

for bond. >> i'm happy for them. >> reporter: do you think there's a chance if all goes well that next year at the oscars you'll be there as a nominee? >> as long as "frozen 3" doesn't come out. >> hopefully, yeah. i'm excited for next year and every year. i'm just looking forward to my life. >> reporter: honored at the 2020 brit awards where she performed "no time to die" live for the first time, billie seemed to address her recent struggle with negative comments on social media. >> i've felt very hated recently. and when i was on the stage, and i saw you guys all smiling at me. [cheers and applause] it genuinely made me want to cry. and i want to cry right now. so -- [cheers and applause] >> reporter: all the awards and acclaims still feel surreal to billie eilish. how are you enjoying the way things turned out.

>> dude, it feels like i'm in a dream and i'm going to wake up and it will all be over, and i'll still be little pimply, chubby 11-year-old. what can replace a mother's embrace? if you've been dreaming about tender wild-caught lobster, dig in to butter-poached, fire-roasted and shrimp & lobster linguini. see? dreams do come true. or if you like a taste of new england without leaving home, try lobster, sautéed with crab, jumbo shrimp and more, or maybe you'd like to experience the ultimate surf and the ultimate turf... with so many lobster dishes, there's something for every lobster fan so hurry in and let's lobsterfest. or get pick up or delivery at redlobster.com (howling wind) (howling wind)

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i thougin that moment. illiant we have not said one word tonight about race. not one word. are you kidding me? the heart and soul of this party is diversity. when a kid succeeds in columbia, south carolina - in las vegas, nevada - that is a triumph for every american. people don't know tom steyer. i've known tom steyer for fifteen years. his commitment on

racial justice and social justice is rock solid. i'm tom steyer and i approve this message.

and finally tonight, the adorably touching moment. this little koala lost its mother in the devastating wildfires in australia. an american veterinarian stepping in with a gift. >> this is for you. >> a stuffed koala, in this magical moment. >> good girl. a hug is always the right size. and that's "nightline." full episodes are

brzezinsktom steyer...k at this. berman: tom steyer... o'donnell: surging in nevada. scarborough: this is working for tom steyer. o'donnell: surging in south carolina. smerconish: i don't think it's just resources. mitchell: surging in two new polls out of nevada and south carolina. wallace: polling at double digits. king: up eleven points from october. that is dramatic. steyer: i'm saying we have a broken government. that's what's going on in washington, dc. it's been bought by corporations, and my question to the american people is who do you think is going to change that? i'm tom steyer and i approve this message. wean air force veteran made of doing what's right,.