Transcript for 2020 Nevada caucus just a week away
Now, to the race for 2020, and the new battle forming. Bernie Sanders now saying mayor Bloomberg, with all of his money, will not be enough to beat president trump, as the other candidates take aim at Bloomberg, too, saying he can't hind behind the ads, the airwaves. And amid new scrutiny tonight, some of those candidates say he must start answering questions. And will the former New York City mayor be on that debate stage this week? ABC's Eva pilgrim from Nevada. Reporter: In California today, the line to see Bernie Sanders snaked for blocks. I hear the establishment saying, oh, Bernie can't win the election. Take a look at this crowd today and tell me we can't win the election. Reporter: Sanders well aware he's now facing a new kind of challenge. Former New York City mayor Michael Bloomberg, spending $380 million and counting to blanket the airwaves with ads. Major Bloomberg, with all his money, will not create the kind of excitement and energy we need to have the voter turnout we must have to defeat Donald Trump. Reporter: Bloomberg firing back that the Sanders campaign brings a different, negative kind of energy, releasing a video highlighting the online anger of so-called Bernie bros. Bloomberg tweeting that when it comes to beating trump, this type of "Energy" is not going to get us there. The billionaire's democratic rivals say now it's high time he come out from behind his campaign ads. He has to answer questions and, of course, I think he should be on that debate stage, which eventually he will be, because I can't beat him on the airwaves, but I can beat him on the debate stage. Reporter: As Bloomberg's poll numbers rise, his path drawing new scrutiny, including his treatment of women in the workplace and allegations of sexist and crude comments reported by multiple outlets, including ABC news. "A Washington post" investigation making waves this weekend, prompting Bloomberg to tweet, I would not be where I am today without the talented women around me. Bloomberg says he's championed women, do you think he still needs to answer for these allegations? Yes, he needs to answer. You're not championing women when you have nondisclosure agreements so they can't tell their side of the story. I want to hear from Mike Bloomberg that he is going to let these women talk. Unmuzzle them and let's find out what's really happening. Eva pilgrim with senator Warren there. And Eva is with us from Nevada tonight. We know the caucus is not even until Saturday. And Eva, we know Michael Bloomberg is not there on the ballot, but we'll find out soon if he'll be on the debate stage? Reporter: That's right. More than 26,000 people have already voted here, many more will be watching that debate in Las Vegas on Wednesday. Mike Bloomberg still needs one more poll to qualify. He has until tomorrow night to get it. He's been off the trail for the last few days and we are hearing that he is preparing just in David? All right, Eva pilgrim, thank you.
This transcript has been automatically generated and may not be 100% accurate.