https://arstechnica.com/tech-policy/2023/10/sec-sues-musk-saying-he-refuses-to-testify-in-twitter-stock-investigation/

The US Securities and Exchange Commission sued Elon Musk yesterday, alleging that he refuses to appear for testimony in an investigation into whether he violated federal law with his purchases of Twitter stock. The SEC asked a federal court to force Musk to testify "as required by the investigative subpoena."

"The subpoena with which Musk failed to comply relates to an ongoing nonpublic investigation by the SEC regarding whether, among other things, Musk violated various provisions of the federal securities laws in connection with (1) his 2022 purchases of Twitter stock, and (2) his 2022 statements and SEC filings relating to Twitter," the SEC alleged in its lawsuit in US District Court for the Northern District of California.