In the filing, Musk argues that restrictions on his tweeting amount to an "unconstitutional power grab" by the SEC and that he didn't even violate the agreement anyway. The battle in federal court is the latest episode in a saga that kicked off last August when Musk tweeted that he was "considering taking Tesla private at $420" and that he'd secured funding. He had not secured funding, Tesla didn't go private, but its stock price went nuts. The SEC was pissed and tried to get Musk barred from running a public company.