BRUSSELS — The Polish government is urging the EU to immediately open an investigation into Elon Musk’s Grok, according to a letter dated July 9 and seen by POLITICO.

Grok’s “offensive remarks” and “erratic and full of expletive-laden rants” on social media X could be a “major infringement” of the bloc’s content moderation rulebook, the Digital Services Act, Poland’s Deputy Prime Minister Krzysztof Gawkowski wrote in the letter addressed to EU tech chief Henna Virkkunen.

The artificial intelligence chatbot came under fire this week for generating offensive responses that included glorifying Nazi leader Adolf Hitler as the best-placed person to deal with alleged “anti-white hate,” and “hoping” that wildfires in the south of France will clean up low-income neighbourhoods in Marseille from drug trafficking.

In a series of posts made after X updated its AI model, Grok also referred to Polish Prime Minister Donald Tusk in highly offensive language, as well as calling him “a traitor.”

“There is reason enough to think, that negative effects for the exercise of fundamental rights, were not made by accident, but by design,” Gawkowski wrote, citing obligations for the biggest platforms such as X to address so-called systemic risks on their sites under the DSA.

X is already under investigation by EU regulators for violating the social media law due to a potential lack of safeguards against illegal content, and was found to be in preliminary breach of other parts of the law including advertising transparency and data access for researchers.

The owner of X and Grok maker xAI said on Wednesday it had removed “inappropriate posts” and stated it had taken action to “ban hate speech before Grok posts on X,” without clarifying what this entails.