On Twitter, some commenters suggested Harris was unfairly portraying herself as African American, since she is the daughter of a Jamaican father and an Indian mother.

By Saturday, Harris’s campaign spokeswoman had retweeted nearly a dozen comments and articles defending her boss, and Harris’s 2020 Democratic challengers forcefully condemned the attacks on social media.

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“This stuff is really vile and everyone should speak out against it,” Lily Adams, Harris’s spokeswoman, wrote on Twitter.

“The attacks against @KamalaHarris are racist and ugly,” Sen. Elizabeth Warren (D-Mass.) tweeted shortly after. “We all have an obligation to speak out and say so. And it’s within the power and obligation of tech companies to stop these vile lies dead in their tracks.”

“@KamalaHarris doesn’t have s--- to prove,” tweeted Sen. Cory Booker (D-N.J.)

Washington Gov. Jay Inslee called the attacks “racist and vile.”

Sen. Amy Klobuchar (Minn.) wrote: “These troll-fueled racist attacks on Senator @KamalaHarris are unacceptable. We are better than this (Russia is not) and stand united against this type of vile behavior.”

Caroline Orr, a behavioral scientist who studies the spread of disinformation online, noted on Twitter a surge of related anti-Harris tweets that posted within minutes of each other during the debate.

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“Efforts to attack Kamala Harris’ race have been around for a while, but a huge volume of tweets pushing this manufactured narrative appeared tonight right after Kamala pointed out that she was the only Black woman onstage,” Orr wrote, with images of the tweets questioning Harris’s racial credentials.

At Thursday’s debate, Harris told Biden that his past stance against federally-mandating busing black students to white schools was personally hurtful because she had benefited from that educational opportunity as a little girl. Afterward, some people on social media falsely claimed that Harris couldn’t lay claim to the afflictions of African Americans.

President Trump’s son, Donald Trump Jr. retweeted, and then deleted, an alt-right commentator named Ali Alexander, stating, “Kamala Harris is implying she is descended from American Black Slaves. She’s not. She comes from Jamaican Slave Owners. That’s fine. She’s not an American Black. Period.”

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In sharing that message to his millions of followers, Trump Jr. tweeted: “Is this true? Wow.”

“This is the same type of racist attacks his father used to attack Barack Obama,” Adams said in email to The Washington Post. “It didn’t work then and it won’t work now.”

Two of Harris’s Democratic primary opponents reacted to Trump Jr.’s comment. Sen. Bernie Sanders (I-Vt.) tweeted: “Donald Trump Jr. is a racist too. Shocker.”

South Bend, Ind. Mayor Pete Buttigieg wrote: “The presidential competitive field is stronger because Kamala Harris has been powerfully voicing her Black American experience. Her first-generation story embodies the American dream. It’s long past time to end these racist, birther-style attacks.”

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Other fringe social media accounts echoed the birtherism conspiracies fueled by Donald Trump before he was in politics regarding President Barack Obama’s citizenship. Now they are questioning whether Harris was eligible to run for president, calling her an “anchor baby” because she was born in the United States to immigrants.

When Harris is asked how she identifies herself, she will often say, as “an American.” But recently, she’s leaned in more to what it meant to grow up black in the wake of the civil rights movement — Harris was born in October 1964, just months after the Civil Rights Act had been signed into law.

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At a recent campaign event sponsored by Planned Parenthood, Harris spoke about growing up and realizing that people treated her mother with less respect because of the color of her skin.

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“I remember people looking down at my mother, assuming she was somebody’s housekeeper and treating her like she was a substandard person,” Harris said. “She was a housekeeper, she kept our house, and happened to be a breast cancer researcher. There was an assumption that this woman had no power and should be given no power.”