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On Monday, Elon Musk followed through with his promise to sue Media Matters over reporting that helped spark the latest advertiser backlash against antisemitic content posted on Musk’s X (formerly Twitter).

Musk’s complaint—bizarrely filed in a Texas court despite X Corp. being based in California and Media Matters in the District of Columbia—accused Media Matters of interference with X Corp.’s contract with advertisers, business disparagement, and interference with a prospective economic advantage by allegedly disrupting X Corp.’s relationship with advertisers.

The lawsuit’s business disparagement claim marks the first time that Musk has sued a group monitoring hate speech on X for defaming the platform. Where individuals can sue for defamation, businesses can sue over disparagement. In this case, Musk must prove that Media Matters knowingly published false statements intended to harm X Corp.’s business to succeed in his lawsuit.