Financial regulators in the US are suing Elon Musk over his refusal to cooperate with their investigation into his purchase of Twitter, now known as X.
The Securities and Exchange Commission (SEC) has asked a federal court to compel Musk to sit for a third session of testimony about the Twitter deal.
Musk's lawyer accused the SEC of "harassment" and stated that Musk declines to acquiesce to the Commission's demands.
This lawsuit is the latest in a series of disputes between Musk and the SEC, with Musk previously expressing a lack of respect for the regulator.
The SEC's investigation is focused on whether Musk's 2022 stock purchases before acquiring Twitter and his statements about these investments violated securities laws.
Musk had participated in two video conference sessions of testimony in July but the SEC deemed another session necessary due to the influx of additional documents.
Musk's attorney questioned the need for further sessions, stating it was unclear why the staff required more of Musk's time.
In 2018, the SEC charged Musk with fraud for a tweet in which he claimed to have "funding secured" to take Tesla private, resulting in a settlement and restrictions on his social media communications about the company.
In a separate case, a judge ruled that Musk must face a lawsuit from former Twitter investors, alleging that he defrauded them by not promptly disclosing his share purchases, although an insider trading claim was dismissed.