Musk has now accused the regulatory agency of "harassment in a calculated effort to 'chill' his right to free speech in its oversight of his communications with shareholders as part of a 2018 agreement that settled civil securities charges against the executive," CNBC reported Thursday morning. 

A court filing on Thursday reads: "The SEC seems to be targeting Mr. Musk and Tesla for unrelenting investigation largely because Mr. Musk remains an outspoken critic of the government. The SEC's outsized efforts seem calculated to chill his exercise of First Amendment rights rather than to enforce generally applicable laws in evenhanded fashion."

The filing is part of an attempt to get the agency's 2018 case against him, wherein he settled and was supposed to appoint a "Twitter sitter" to approve his Tweets, shelved. Many, including us, have been skeptical that Musk has been running his Tweets through the required channels before posting.