Sen. Elizabeth Warren and former Vice President Joe Biden are among the 2020 Democratic presidential candidates slamming the racist birther attacks on Sen. Kamala Harris by Donald Trump Jr. and his cronies.

Trump Jr., retweeted and later deleted a post from a felon who questioned Harris’ blackness because she is Indian and Jamaican. By the way, Jamaican is not a race. It’s a nationality — made up of many ethnicities but mostly of African descent.

This is a page right out of the birther movement, led by Donald Trump, that claimed Barack Obama was born in Kenya. This is yet another attempt to depress black voter turnout, but we all know how it turned out in 2008 and 2012. President Obama won — resoundingly.

Sen. Elizabeth Warren tweeted: “The attacks against @KamalaHarris are racist and ugly. 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.”

Joe Biden tweeted: “The same forces of hatred rooted in ‘birtherism’ that questioned @BarackObama’s American citizenship, and even his racial identity, are now being used against Senator @KamalaHarris. It’s disgusting and we have to call it out when we see it. Racism has no place in America.”

Cory Booker tweeted: [Kamala Harris] doesn’t have shit to prove.

Bernie Sanders tweeted: “Donald Trump Jr. is a racist. Shocker.”

Beto O’Rourke tweeted: “There’s a long history of black Americans being told they don’t belong—and millions are kept down and shut out to this day. @KamalaHarris is an American. Period. And all of us must call out attempts to question her identity for what they are: racist.”

Julian Castro slammed the attacks: “These disgusting and racist attacks are part of a right-wing effort to delegitimize an accomplished and powerful black woman.

Senator Harris has lived an American dream story, and we shouldn’t give voice to those attempting to undermine it.”

Pete Buttigieg weighed in: “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.”

Amy Klobuchar also weighed in: “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.”

Former Gov. Jay Inslee tweeted: “The coordinated smear campaign on Senator [Kamala Harris] is racist and vile. The Trump family is peddling birtherism again and it’s incumbent on all of us to speak out against it.”