2020 Democratic candidates clash in final debate of the year

Seven candidates took the stage at Loyola Marymount University and talked about the economy, climate change, recent trade deals and the impeachment of President Donald Trump.
4:04 | 12/20/19

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Transcript for 2020 Democratic candidates clash in final debate of the year
Now we turn to the Democrats running for president in that fiery debate overnight. The last one of the year and gloves were off with Pete buttigieg feeling the heat and linsey Davis was there for it all and joins us from los Angeles. Good morning, linsey. Reporter: Hey, good morning to you, Michael. That's right. Things certainly got hot at times last night despite the fact that the first hour was pretty much politics as usual but then there was a sharp turn as the conversation changed to campaign financing which prompted a massive pile on mayor Pete and that wouldn't be the only clash of the night. Fast-rising candidate Pete buttigieg walked onto the debate stage with a target on his BAC and it didn't take long for the gloves to come off. The mayor just recently had a fund-raiser that was held in a wine cave full of crystals and served $900 a bottle wine. Think about who comes to that. Billionaires in wine caves should not pick the next president of the United States. Mr. Mayor, your response. You know, according to "Forbes" magazine, I am literally the only person on this stage who is not a millionaire or a billionaire. So if -- This is important. This is the problem with issuing purity tests you cannot yourself pass. -- Did not come here to listen to this argument. I came here to make a case for progress and I have never even been to a wine cave. I've been to the wind cave in South Dakota which I suggest you go to. Reporter: Buttigieg, the mayor of South Bend, Indiana has been picking up steam in Iowa and New Hampshire but the youngest candidate has also faced questions about his experience and electable. Senator Amy klobuchar calling him out on an earlier loss in a statewide race. And I would -- mayor, if you -- if you had won in Indiana that would be one thing. You tried and you lost by 20 points. Reporter: But the mayor firing back. If you just go by vote totals, maybe what goes on in my city seems small to you. If you want to talk about the capacity to win, try putting together a coalition to bring you back to office with 80% of the vote as a gay dude in Mike pence's Indiana. Reporter: On impeachment Democrats were united. A constitutional necessity for the house to act as it did. Reporter: The final debate was the smallest yet with only seven candidates on the stage. There was more talking time to go around benefiting the only minority at the debate, Andrew yang. And the question is why am I the lone candidate of color on this stage? Fewer than 5% of Americans donate to political campaigns. You know what you need to donate to those? Disposable income. Reporter: It was this moment. A little kid who says I, I, I can't talk. What two I do? Reporter: It prompted an attack from Sarah Sanders mocking his stutter. He wrote back, I have worked my whole life to overcome a stutter. It is my great honor to mentor kids who have edge experienced the same. It's called empathy. Look it up. Sanders later apologized and while Biden did have a strong night, the general consensus at least from inside the room is that senator Amy klobuchar shined as she tried to make a case while somebody from the midwest ought to oval office. I think actually, linsey, one of these debates that one of the best debates of the cycle. The moderators did a good job and everybody had and saw a lot in that piece, moments to shine from Biden to klobuchar to buttigieg, Sanders and Warren so it's almost a shame it happened so late in the year right before the holiday. Fewer candidates allowed the lesser ones to shine. We shift and head to breaking news.

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

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