Joe Biden says Trump’s comments to Ukraine president ‘crosses the line’

Many other Democratic presidential candidates have also accused Trump of abusing his power.
3:33 | 09/22/19

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Transcript for Joe Biden says Trump’s comments to Ukraine president ‘crosses the line’
Now to the race for 2020. Democratic contenders dishing out their pitches for the white house at the Iowa steak fry. The presidential hopeful trying to pick up momentum. The hot topics on the menu a report that president trump urged Ukraine's president to investigation Joe Biden's son and the poll showing a new frontrunner for the Democrats. Rachel Scott has more. Good morning, Rachel. Reporter: Good morning, Eva. Nearly the entire democratic field was in Iowa. Trying to gain fraction. It was that whisleblower controversy that dominated. In a show of political force Democrats descending on Iowa. Elizabeth Warren in the house. Reporter: With marching bands, drum lines, and armies of supporters for a revived state tradition, the Iowa steak fry. For the party's early frontrunner it was a chance for a swing across the aisle. Joe Biden on defense fending off attacks from trump. He'll do whatever he has to do. This crosses the line. Reporter: "The Wall Street journal" reports president trump repeatedly pressed the Ukrainian president to investigate Biden's son who served on the board of a Ukrainian energy company when his father was vice president. Trump is doing this because he knows I'll beat him like a drum. He's using the abuse of power and every almost of the presidency to do something to smear me. Reporter: Biden pointing to a call between president trump and the leader of Ukraine reportedly at the center of a whistleblower complaint from an intelligence official. The inspector general found that complaint credible. The justice department and acting director of national intelligence blocked it from being shared. I never spoke to my son about his oversea's affairs. How do you know -- I know trump deserves to be investigated. He is violating every basic norm of a president. Reporter: The former vp demanding the president release the transcript of the call in question. Some 2020 rivals echoing his concern, accusing president trump of potentially abusing his power. If it's true, it's a betrayal of the United States. It's smack dab in the middle of the need to begin impeachment proceedings. You have a president clearly unfit to serve in the oval office. Reporter: President trump has defended that call, denying any wrong doing. While some Democrats have renewed their calls for impeachment. House speaker Nancy Pelosi has not bulged on the issue. She's still reluctant to pursue that course worried it may hurt the party ahead of 2020. Eva? Rachel, let's go back to that new Des Moines poll in Iowa. It shows senator Elizabeth Warren surging. Now neck and neck with Joe you spoke with several candidates in the democratic field this weekend. Are there signs the field may narrow if these candidates can't keep momentum? Reporter: Yes, Eva. Some candidates are just simply trying to hang on. When I spoke to senator Cory booker he said the next ten days will be critical on whether or not his campaign stays in the race. His came pan is trying to raise $1 million before October. The senator told me if his campaign can't grow he's simply taking up space. Rachel Scott for us in Iowa, thank you.

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

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