Tech billionaire and X owner Elon Musk is coming for Media Matters for America, a left-leaning media watchdog group. Amid a flurry of departures from X, with several companies opting to withdraw their advertisements from the social media giant, Musk has declared his intention to file a lawsuit against Media Matters for running a misleading story with the intention of undermining free speech on his platform.

At the heart of the lawsuit is the Media Matters article published on Thursday, which alleged that X was placing ads for major corporations alongside Nazi-related content. The article also claimed that advertisements for companies, including Disney and Apple, appeared as anti-Semitic posts on the platform.

In a post on X, Musk wrote, “The split second court opens on Monday, X Corp will be filing a thermonuclear lawsuit against Media Matters and ALL those who colluded in this fraudulent attack on our company.”

He added in a subsequent tweet that the lawsuit would not only target Media Matters but also the individuals on its board and their alleged “network of dark money.”

Attached in the initial tweet is a press release in which Musk explained that the Media Matters story “completely misrepresented the real user experience on X, in another attempt to undermine freedom of speech and mislead advertisers.”

He asserted X’s commitment to free speech, even when it involves objectionable content, emphasizing that people have the right to choose what they read or watch.

The press release went on to condemn the attacks on X from activist groups like Media Matters and mainstream media outlets, suggesting that these entities perceive X as “a threat to their ideological narrative and those of their financial supporters.”

According to Musk, Media Matters manipulated the experience by using an alternate account to curate the content that appeared on the timeline. “Once they curated their feed, they repeatedly refreshed their timelines to find a rare instance of ads serving next to the content they chose to follow,” he explained.

Musk pointed to X’s internal data, revealing that of the 5.5 billion ad impressions on the day Media Matters conducted its research, less than 50 were served alongside the content highlighted by Media Matters. He also highlighted a specific example involving a brand mentioned in the article, stating that its ads were seen adjacent to specific posts only by the author of the Media Matters article.

Musk has consistently portrayed X as a “free speech platform,” a position reasserted in the statement released on Saturday. The statement stressed the importance of freedom of speech in maintaining a thriving democracy, stating, “Without freedom of speech, we lose the checks and balances critical to a flourishing society.”

In the wake of the story by Media Matters, several corporations, including Apple and IBM, announced their decision to halt advertising on the platform. Disney, Warner Bros. Discovery, Comcast/NBCUniversal, Lionsgate, and Paramount Global also joined the chorus in pausing ads on the social media platform.

Despite the lawsuit threat, Media Matters is standing its ground, with President Angelo Carusone saying, “If he (Musk) does sue us, we will win.”