US backs Musk's legal challenge against EU fine

The US Department of Justice has submitted an application to the EU's Court of Justice—the bloc's second-highest court—to support Musk's bid to annul the fine, according to official filings. The decision represents a significant escalation in the transatlantic dispute and reflects growing US interest in the outcome of regulatory actions against American tech executives and companies operating in Europe.

The fine in question was levied by EU authorities in December 2025, though details of the specific allegations remain under legal consideration by the court. The US application signals Washington's willingness to formally intervene in European regulatory matters affecting American citizens and business interests, a move that underscores broader tensions over tech regulation between the two jurisdictions.

The legal challenge comes amid ongoing friction between the US and EU over technology sector oversight and enforcement actions. American authorities have increasingly involved themselves in cases affecting prominent US-based entrepreneurs and corporations facing penalties in Europe, viewing such interventions as protecting national interests.

The Court of Justice will now consider both Musk's annulment bid and the US submission as it reviews the case. The outcome could have implications for future regulatory enforcement actions in Europe against American tech sector figures and companies.