Elon Musk yesterday appealed to the Supreme Court in a last-ditch effort to terminate his settlement with the Securities and Exchange Commission. Musk has claimed he was coerced into the deal with the SEC and that it violates his free speech rights, but the settlement has been upheld by every court that’s reviewed it so far.

In his petition asking the Supreme Court to hear the case, Musk said the SEC settlement forced him to “waive his First Amendment rights to speak on matters ranging far beyond the charged violations.”

The SEC case began after Musk’s August 2018 tweets stating, “Am considering taking Tesla private at $420. Funding secured” and “Investor support is confirmed. Only reason why this is not certain is that it’s contingent on a shareholder vote.” The SEC sued Musk and Tesla, saying the tweets were false and “led to significant market disruption.”