Meghan McCain blasts Trump Jr. for retweeting 'disgusting' and 'racist' post about Kamala Harris

Meghan McCainMeghan Marguerite McCainMeghan McCain to release audiobook on 'bold conservatism' for 21st century Meghan McCain presses Steyer on 2020 bid: 'You have not proven that you can inspire people' Ryan denies protesting national anthem at Democratic debate MORE, the daughter of late Sen. John McCainJohn Sidney McCainMcCain's family, McCain Institute to promote #ActsOfCivility in marking first anniversary of senator's death Arizona poll shows Kelly overtaking McSally 3 real problems Republicans need to address to win in 2020 MORE (R-Ariz.), on Sunday denounced Donald Trump Jr.Donald (Don) John TrumpPETA billboard in Baltimore calls Kushner a 'rich pest' Dick Cheney to attend fundraiser supporting Trump reelection: report House chairman warns foreign governments to 'cease and desist' spending money at Trump properties MORE for sharing a far-right conspiracy theory questioning the racial heritage of Sen. Kamala HarrisKamala Devi HarrisHarry Reid: 'Decriminalizing border crossings is not something that should be at the top of the list' Warren offers plan to repeal 1994 crime law authored by Biden Sanders leads Democratic field in Colorado poll MORE (D-Calif.), a 2020 presidential candidate. 

"What's happening to @KamalaHarris is disgusting and unquestionably racist," she tweeted. "And while the tweet was deleted, it appears that the Trump family tradition of spreading racial demagoguery and conspiracy theories lives on...," she added.

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McCain's comments come as many 2020 presidential candidates voice outrage over a social media post that falsely claimed the California senator, who is of Indian and Jamaican descent, is not black. 

President TrumpDonald John TrumpFacebook releases audit on conservative bias claims Harry Reid: 'Decriminalizing border crossings is not something that should be at the top of the list' Recessions happen when presidents overlook key problems MORE's eldest son retweeted a post by Ali Alexander, a conservative media personality, claiming that Harris “comes from Jamaican Slave Owners” but is “not an American Black.”

“Is this true? Wow,” Trump Jr. tweeted to his 3.65 million followers before deleting it.

Harris's campaign on Saturday denounced the online attacks, comparing them to the conspiracy theories produced about former President Obama's place of birth. 

"This is the same type of racist attack his father used to attack Barack ObamaBarack Hussein ObamaBen Shapiro: No prominent GOP figure ever questioned Obama's legitimacy 3 real problems Republicans need to address to win in 2020 Obama's high school basketball jersey sells for 0,000 at auction MORE," Harris spokeswoman Lily Adams told CNN. "It didn't work then and it won't work now."

A spokesman for Trump Jr. told The New York Times that his post was a misunderstanding. 

“Don’s tweet was simply him asking if it was true that Kamala Harris was half-Indian because it’s not something he had ever heard before,” said spokesman Andy Surabian, “and once he saw that folks were misconstruing the intent of his tweet, he quickly deleted it.”

President Trump helped promote the conspiracy theory that questioned whether Obama was born in the United States. 

"The whole thing was crazy and mean-spirited, of course, its underlying bigotry and xenophobia hardly concealed," former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaJuan Williams: Democrats finally hit Trump where it hurts Michelle Obama to present Lin-Manuel Miranda with the Portrait of a Nation Prize Michelle Obama thanks her high school for naming new athletic complex after her MORE wrote in her memoir, "Becoming." "But it was also dangerous, deliberately meant to stir up the wingnuts and kooks."

McCain, a daytime talk show host, has repeatedly criticized Trump during his time in office.

She said in late May that Trump was a "child" who will always be "deeply threatened" by her father following a report that the White House wanted the USS John S. McCain "out of sight" during the president's visit to Japan.