Elon Musk shared that the Security and Exchange Commission issued a "settlement demand" in a long-running probe of his purchase of the social media platform now known as X.

The U.S. Securities and Exchange Commission has given Elon Musk until Monday to respond to an offer to resolve a probe into the billionaire's $44-billion takeover of Twitter in 2022, a source familiar with the matter told Reuters.

The mercurial entrepreneur took to his own social media platform X—whose purchase attracted the regulator's attention—to air his grievances.