A federal court ordered on Tuesday that Elon Musk must testify again in the U.S. Securities and Exchange Commission’s investigation into his $44 billion takeover of Twitter.

The SEC sued Musk in October to compel the CEO of electric carmaker Tesla (TSLA.O), opens new tab and rocket company SpaceX to testify after he refused to attend a September interview for the investigation. The billionaire said the SEC was trying to “harass” him with a number of subpoenas.

The investigation concerns whether Musk broke federal securities laws in 2022 when he bought stock in Twitter, which he later renamed X. It is also reviewing statements and SEC filings he made in relation to the deal, the agency has previously said.

U.S. Magistrate Judge Laurel Beeler in February ruled in favor of the agency to compel the deposition and Musk requested a review of the decision.

“As Judge Beeler explained, the investigations Musk contends constitute harassment are ‘legitimate government investigations’,” U.S. District Judge Jacqueline Scott Corley said on Tuesday.