2020 candidates defend Kamala Harris from attacks on her background

Democratic presidential candidates are banding together as race becomes a key issue in the campaign.
2:54 | 06/30/19

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Transcript for 2020 candidates defend Kamala Harris from attacks on her background
George, thank you. Here at home, democratic presidential candidates are vying for votes but banding together as race becomes a key issue in this campaign. ABC's Rachel Scott is in Chicago where several candidates are courting African-American voters at the rainbow push coalition and defending kamala Harris from a new attack on her background. Rachel, good morning. Reporter: Good morning, Eva, senator Harris identifies as black. She graduated from a historically black college. But her racial identity is being called into question. And the now 2020 presidential candidates are putting politics aside to back her up. This morning, the pack of democratic candidates united to defend one of their own -- after online attacks questioned the racial identity of senator kamala Harris. One person tweeting, kamala is not an American black. She's half Indian and half Jamaican. I'm so sick of people robbing American blacks like myself of our history. The tweet reportedly gaining attention after "The New York Times" reports Donald Trump Jr. Shared it, later deleting it. Part of the strength of our nation -- These attacks on Harris claims she's not African-American and her ancestors didn't experience U.S. Slavery. Harris born to immigrant parents, identifies as black. This trefrs over her racial identity reminisce September of the birtherism debate that falsely claimed that Barack Obama wasn't born in the United States. Harris' campaigns campaign said, those attacks didn't work then and they won't work now. Senator Elizabeth Warren fresh off making her pitch to a black church on the south side of Chicago. We are in a fight for the very soul of our nation. Reporter: Stepped in as the first candidate to defend Harris, calling the accusations racist and ugly. Joe Biden labeled the attacks disgusting. Just after Harris challenged his civil rights record on the debate stage. You also worked with them to oppose busing. Reporter: An unlikely source cutting Biden some slack. I think she was given too much credit for what she did. It wasn't too outstanding. Reporter: Back in South Bend, racial tensions prompted major Pete buttigieg to step off the trial after the fatal shooting of a black man by a white police officer. This is my home. These issues can't be separated. The challenge we face here in South Bend is symptomatic of a national challenge. Reporter: And mayor Pete will be back on the campaign trial on Tuesday, stopping right here in Chicago. Whit? Rachel Scott for us in Chicago. Thanks so much.

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

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