Meghan McCain Meghan Marguerite McCainKasich to Meghan McCain: Concern over abortion 'dwarfed' by need to beat Trump Meghan McCain says she believes report Trump called fallen soldiers 'losers' Meghan McCain hits Ivanka Trump's defense of president's Twitter: It's not a 'communication style,' it's 'cruelty' MORE, the daughter of late Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.), on Sunday denounced Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE for sharing a far-right conspiracy theory questioning the racial heritage of Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing 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.

— Meghan McCain (@MeghanMcCain) June 30, 2019

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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 Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance 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 Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa 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 Obama Michelle LeVaughn Robinson ObamaBlack stars reimagine 'Friends' to get out the vote Obama shares phone number to find out how Americans are planning to vote Michelle Obama: 'Don't listen to people who will say that somehow voting is rigged' 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.