• Elon Musk referenced Eminem in a court filing on Tuesday.

• Musk wants out of an agreement with the SEC that requires Tesla lawyers to approve his tweets.

• The SEC is investigating tweets in which Musk asked his followers whether he should sell billions worth of Tesla stock.

Elon Musk once again urged a federal judge to throw out a 2018 agreement he made with the Securities and Exchange Commission that requires Tesla lawyers to vet many of his tweets.

In a court filing on Tuesday arguing that the tweet-regulating arrangement violates Musk's first-amendment rights, the CEO's lawyers referenced an unexpected source: the rapper Eminem.

"The [SEC] won't let me be or let me be me so let me see / They tried to shut me down," Musk's lawyers said, quoting the 2002 Eminem song "Without Me" and replacing "FCC" with "SEC."

They invoked Eminem to make the point that "the First Amendment requires that agencies proceed with caution when constitutional rights are at stake." They referenced the Federal Communication Commission's 2002 decision to rescind fines against a Colorado radio station for playing Eminem's "The Real Slim Shady."

In a tweet about the Eminem reference, Musk joked that he and the rapper are "basically identical."

The SEC originally charged Musk with misleading investors in 2018 as a result of a tweet saying he was "considering taking Tesla private at $420" per share. Musk and Tesla settled the charges. As part of the agreement, Tesla lawyers would be required to approve any of Musk's tweets containing information that could impact the company's stock price.

Tesla and the SEC have gone back and forth for years over whether or not the company is adhering to the agreement. In November, the regulator subpoenaed Musk for information about the vetting process surrounding a series of tweets about selling billions of dollars worth of Tesla shares.