Elizabeth Warren pressed on Medicare-for-all plan during debate

She was the target of the night as new national polls showed her leading the pack of 12 Democratic candidates.
2:35 | 10/17/19

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Transcript for Elizabeth Warren pressed on Medicare-for-all plan during debate
democratic showdown. The fourth presidential debate and it was clear, Elizabeth Warren is a front-runner at the top of recent national polls because the other candidates were taking aim at Warren. In particular, on a key issue about taxes. ABC's linsey Davis was in the debate hall. Reporter: Elizabeth Warren was the target of the night, taking incoming fire now that she's leading the pack in new national polls. Pressed on her medicare for all plan, she was asked repeatedly, will taxes go up? Will you raise taxes on the middle class to pay for it? Yes or no? So, I have made clear what my principles are here and that is costs will go up for the wealthy and for big corporations, and for hard working middle class families, costs will go down. Reporter: A yes or no question that didn't get a yes or no answer. Look, this is why people here in the midwest are so frustrated with Washington. At least Bernie's being honest here and saying how he's going toe pay for this, and that taxes are going to go up. And I'm sorry, Elizabeth, but you have not said that, and I think we owe it to the American people to tell them where we're going to send the invoice. The problem we've got right now is the overall cost of health care. And look, you can try to spin this any way you want. I have spent my entire life on working on how America's middle class has been hollowed out and how we fight back. Senator klobuchar, do you want to respond? Ah, yes, I do. And I appreciate Elizabeth's work. But again, the difference between a plan and a pipe dream is something that you can actually get done. Reporter: Vice president Biden asked about his son hunter's business dealings in Ukraine. My son did nothing wrong. I did nothing wrong. I carried out the policy of the United States government in rooting out corruption in in Ukraine. Reporter: But the focus continued to come back to Warren who was pressed to defend her wealth tax. My question is not why do Bernie and I support a wealth tax, it's why doesn't -- does everyone else in the stage think it's more important to protect billionaires than it is to invest in an entire generation? I want to give a reality check to Elizabeth. No one on this stage wants to protect billionaires. Not even the billionaire wants to protect billionaires. Reporter: Despite all the dissension, there were two moments of unity. First, on the issue of impeachment, they all agree the president should be impeached. And also as they welcomed senator Sanders back to the campaign trail after his heart attack. He thanked them for their support. All right, linsey, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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