(Reuters) -Elon Musk has accused Apple ( AAPL ) of engaging in antitrust violations by allegedly making it impossible for any artificial intelligence company other than OpenAI to reach the No. 1 spot in its App Store rankings, calling it an "unequivocal antitrust violation."

"xAI will take immediate legal action," Musk said in an X post on Monday.

xAI, Apple ( AAPL ) and OpenAI did not immediately respond to Reuters' requests for comment.

Earlier in the day, Tesla chief Musk questioned the app spotlighting practices of the iPhone maker's App Store.

"Hey @Apple App Store, why do you refuse to put either X or Grok in your 'Must Have' section when X is the #1 news app in the world and Grok is #5 among all apps? Are you playing politics?," he said in another post on the social media platform.