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

Meghan McCainMeghan Marguerite McCainBidens confirm 'we still love each other' after finger biting goes viral Trump Jr. visit to 'The View' boosts ratings to highest in six months Meghan McCain to Trump Jr. on 'The View': 'You and your family have hurt a lot of people' MORE, the daughter of late Sen. John McCainJohn Sidney McCainJeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House panel debates articles of impeachment Budowsky: Would John McCain back impeachment? MORE (R-Ariz.), on Sunday denounced Donald Trump Jr.Donald (Don) John TrumpMelania Trump's 'Be Best' hashtag trends after president goes after Greta Thunberg Trump Jr. blasts Time for choosing 'marketing gimmick' Greta Thunberg as Person of the Year White House calls Democratic witness's mentioning of president's youngest son 'classless' MORE for sharing a far-right conspiracy theory questioning the racial heritage of Sen. Kamala HarrisKamala Devi HarrisOvernight Health Care — Presented by That's Medicaid — House passes sweeping Pelosi bill to lower drug prices | Senate confirms Trump FDA pick | Trump officials approve Medicaid work requirements in South Carolina Sanders endorses Young Turks founder Cenk Uygur for Katie Hill's former House seat Kamala Harris dropped out, but let's keep her mental health plan alive 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 TrumpSenate gears up for battle over witnesses in impeachment trial Vulnerable Democrats tout legislative wins, not impeachment Trump appears to set personal record for tweets in a day 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 ObamaDemocrats' self-inflicted diversity vulnerability Gaetz: We didn't impeach Obama even though 'a lot of constituents' think he abused his power Live coverage: House panel debates articles of impeachment 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 ObamaPanel: Andrew Yang beats Joe Biden in ad dollars, Michelle Obama on GWB 'our values are the same' Michelle Obama, Ellen DeGeneres surprise DC elementary school with new computer lab, 0K donation Hillary Clinton documentary to premiere at Sundance 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.