US Justice Department Moves to Back X Against EU's 120 Million Euro Digital Services Act Fine

The United States has formally asked the European Union's second-highest court for permission to join Elon Musk's fight against a landmark EU penalty on his social media platform X. The move, confirmed on 24 September 2026, turns a corporate appeal into a direct clash between Washington and Brussels over who gets to regulate the world's largest digital platforms, and it sets the stage for the first courtroom test of Europe's flagship content law.

The penalty at the centre of the dispute is a €120 million fine, about $137 million or £105 million, that the European Commission imposed on X on 5 December 2025. It was the first non-compliance penalty ever issued under the Digital Services Act, the bloc's sweeping rulebook that requires online platforms to do more to tackle illegal and harmful content and to open their systems to outside scrutiny. The sanction followed a two-year-long investigation, and it was imposed jointly and severally.

X did not accept the decision. X Internet and X Holdings filed one case against the Commission, and Elon Musk filed a second in his own name. The two actions are registered at the General Court of the European Union in Luxembourg as Case No. T-114/26 and Case No. T-121/26. X's appeal, lodged on 16 February 2026, accused the Commission of a sloppy investigation and grave procedural errors.

Now the US Department of Justice wants a seat at the table. Its Civil Division lodged an application to intervene in both cases on 24 September, arguing that the Commission stretched its authority beyond the territory it is entitled to police and warning that the precedent could touch many American technology groups.

Key Facts

CNBC reported on September 24 that the US government had formally sought to join Musk's legal challenge to dismiss the €120 million, or $137 million, fine. The Department of Justice said it had filed an application with the EU's General Court in support of X's effort to annul the case, and that the filing was supported by the Department of State, which helped draft it.

According to the department's own release, also dated 24 September, the United States filed to intervene in X Internet and X Holdings v. Commission, Case No. T-114/26, and Musk v. Commission, Case No. T-121/26. The release states that the fine of €120,000,000 was imposed jointly and severally and was based on the total worldwide annual turnover of the single economic unit ultimately controlled by Elon Musk, or that of X Holdings Corp.

Assistant Attorney General Brett Shumate, who heads the Justice Department's Civil Division, said the European Commission had "inappropriately attempted to expand its regulatory authority to reach American companies not present or operating within its jurisdiction." He added that Washington "will not tolerate the European Commission engaging in regulatory overreach to try and control American engines of innovation and economic growth."

BBC News reported on September 25 that the DOJ filing argued the Commission had wrongly expanded its reach, and that the EU said it was ready to defend the penalty. The BBC noted that the December 2025 decision said X "deceives users" by allowing people to pay for a blue verified check mark because it is not "meaningfully verifying" who is behind the account.

EU Perspectives reported on September 25 that the Commission based the €120 million sum on the global turnover of the single economic unit that Musk controls, so the US argues the decision reaches Musk personally and firms with no link to X. The same outlet noted that beyond blue ticks, regulators accused X of failing to provide transparency around its adverts and of denying researchers access to public data.

Analysis

The Commission's decision rested on three findings. Regulators said X sold pay-for blue checkmarks as verified without real identity checks, ran an opaque advertising repository, and blocked researchers from accessing public data. Henna Virkkunen, the Commission's executive vice-president for tech sovereignty, said the fine held X "responsible for undermining users' rights and evading accountability." The Commission has said its laws do not target any nationality and that it is merely defending digital and democratic standards that serve as a benchmark for the rest of the world.

Why the intervention is unusual comes down to standing. EU Perspectives reported on September 25 that under the Statute of the Court of Justice of the European Union, a state may intervene if it can establish an interest in the result of the case. The DOJ said the US "has a clear interest" in ensuring any decision is applied consistently with "how territorial jurisdiction is generally understood in international law," and that intervening would not "otherwise prejudice" US-headquartered digital services that "contribute significantly" to its economy.

What this really means is that a fight over a single nine-figure fine has become a test of how far Brussels can reach into American boardrooms at the parent-company level. The department warned that if the Commission's approach is upheld, it may have significant implications for "very large online platforms" and other similar entities operating in the digital services sector within the EU, many of which are domiciled at parent level within the United States. That framing deliberately turns a content-moderation case into a question of international jurisdiction.

Brussels is not backing down. Commission spokesperson Thomas Regnier said at a press briefing on 25 September that the bloc was "ready to defend" its position and had a "solid case." EU Perspectives reported that he said the US move changed "absolutely nothing" from the EU side, a signal that the Commission intends to litigate the merits rather than settle quietly. That signals a long fight rather than a quick settlement, and it keeps the December 2025 decision fully in force for now.

Why It Matters

The intervention widens a transatlantic dispute that goes well beyond checks and content rules. US Secretary of State Marco Rubio wrote that the fine "isn't just an attack on X, it's an attack on all American tech platforms and the American people by foreign governments." The administration of US President Donald Trump has argued that Europe's crackdown singles out American companies, while the Commission insists its rules are nationality-neutral. The department said the US looks forward to the opportunity to address these concerns and issues in detail before the General Court.

The tension has already spilled into other channels. EU Perspectives reported that the US Trade Representative threatened fees on European firms including Accenture, DHL, Siemens and Spotify, and that the State Department sanctioned five people including former EU commissioner Thierry Breton. Meanwhile the Commission fined Temu €200 million in May 2026, showing that Brussels is willing to keep using the DSA against large platforms.

The case also matters because X is already partially complying. In July 2026 the Commission accepted X's plan to fix its ad repository and researcher data access, and the platform renamed its blue checkmarks "premium." X now has six months to implement that action plan, even as its lawyers press for the underlying decision to be annulled.

Next Up

The General Court must now decide whether to grant the US application to intervene before it reaches the merits of Case No. T-114/26 and Case No. T-121/26. X's own appeal, filed on 16 February 2026, will run alongside the American request, and the Commission has said it is absolutely ready to defend its position in court.

If the court allows Washington in, the annulment battle will become the first open contest over a DSA penalty with a national government sitting on the applicant's side, and the outcome will shape how far EU platform rules can reach across the Atlantic.