Twitter CEO Jack Dorsey formally apologized on Thursday for allowing a white supremacist group to sponsor an advertisement in violation of the company’s own policies.

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Dorsey made the apology in a short tweet.

The advertisement in question was widely criticized after Los Angeles musician Ariana Lenarksky published a screenshot of the advertisement and sent to Twitter in a public message. The advertisement was promoting an article titled, “The United States Was Founded as a White People’s Republic.”

The account that originally placed the advertisement has been suspended. Twitter’s ad policy states that “hate speech or advocacy against an individual, organization or protected group based on race, ethnicity, national origin, color” is strictly prohibited. At the time, Twitter spokesperson told Gizmodo, “We do not comment on individual accounts, for privacy and security reasons.”

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It’s still unclear what Dorsey meant by “did a retro,” but hopefully it means that hate groups won’t be allowed to promote content across the network. For now, all we can do is hope for the best.