The SEC has sued Elon Musk for allegedly delaying disclosure of his 9% stake in Twitter, now X, during his 2022 acquisition, allowing him to purchase shares at artificially low prices and underpay shareholders by $150 million. Musk's lawyer called the case a minor paperwork issue, accusing the SEC of harassment. The lawsuit highlights Musk's broader regulatory conflicts and comes amid his close ties to Donald Trump, who has appointed him to lead a government efficiency advisory group.