US Seeks to Join X’s Challenge to €120 Million European Union Fine

Key Facts

The United States has applied to intervene in challenges brought by X and Elon Musk against a €120 million European Union fine. The Justice Department announced the move on September 24, 2026, saying it sought to support the challengers before the European Union General Court. The filing is a procedural request: the court must allow Washington to participate before it can present arguments in the case. The fine stems from a European Commission decision issued on December 5, 2025, concerning the platform’s obligations under the Digital Services Act. The dispute has therefore expanded from the company’s appeal against a regulatory decision to a formal US bid to take part in the litigation.

The Commission set the fine in euros, the currency of the financial obligation at issue in the appeal. Its decision identified 3 breaches involving the presentation of the blue verification checkmark, transparency of the advertising repository and access to public data for researchers. The Commission said it calculated the fine with regard to the nature and duration of the breaches and their gravity for European Union users. Those findings concern specific statutory obligations rather than a general penalty for material posted on the platform. A judgment setting aside all or part of the decision could change the financial obligation, while rejection of the appeals would leave the Commission’s decision in place.

On verification, the Commission found that a blue checkmark available through payment could suggest an account holder’s identity had actually been checked. It said paid verified status without meaningful identity checks made it harder for users to judge the authenticity of accounts and content. The regulatory mechanism lies in the trust signal shown to users, rather than in the sale of a subscription itself. The Commission said the misleading signal could expose users to impersonation, fraud and other forms of manipulation. The X companies contest that finding, putting the interpretation of the platform’s interface before the court.

The Commission separately found that the design of X’s advertising repository and barriers to using it fell short of transparency and search requirements. It cited processing delays and missing information about an advertisement’s content, subject and paying legal entity. A repository that can be examined lets researchers and the public trace paid messages and assess who is behind them, so its usefulness depends on accessible, complete information. In their appeal, the X companies challenge the Commission’s reading of search requirements, its assessment of the repository’s reliability and its findings on access through an application programming interface. The repository dispute thus presents a separate question from the one concerning verification labels.

Another part of the decision addresses eligible researchers’ access to public data on X. The Commission said the platform’s terms and application procedures placed unnecessary barriers in their way, including restrictions on collecting public data automatically. That access matters because researchers use examinable data to study risks arising on the platform within the European Union. The X companies respond that the Commission misread the legal obligation and did not establish a breach throughout the period it identified. The court’s ruling on this issue will determine whether the Commission’s assessment of access restrictions stands independently of its other findings.

X Internet and X Holdings filed their challenge on February 16, 2026, in case T-114/26, according to the notice published in the Official Journal of the European Union. They seek to annul the Commission’s decision in whole or in part, with full or partial cancellation of the fines as an alternative remedy. The notice sets out 6 pleas covering rights of defence, identification of the service provider, assessment of the breaches and calculation of the fines. Musk filed a separate challenge in case T-121/26 seeking to annul the decision, the portion addressed to him or the fine imposed on him. Those requests put both liability and the size of the penalty before the court.

The Justice Department’s argument focuses on the reach of European Union regulation and on which parties may be held liable. It says the Commission’s approach extended scrutiny to Musk personally and to other US entities in the ownership structure whose connection to the service it disputes. Washington links that objection to the separation between a company and its shareholders, as well as the cross-border reach of the decision. These are positions advanced by the US government in support of its application; the court has not ruled on their merits. If intervention is allowed, the United States can develop those arguments in the proceedings, but its application alone does not cancel the fine.

The case has a financial dimension beyond the question of whether the breaches occurred. According to the Justice Department, the Commission linked the penalty to a single economic unit’s worldwide annual turnover and imposed joint liability for €120 million. The appeals dispute both the identity of the service provider and the calculation of the fine, so the scope of liability could change even if every objection to the regulatory findings does not succeed. For anyone assessing exposure among the entities involved, complete cancellation differs from a lower penalty or liability confined to a particular company. The US application determines none of those outcomes; the court’s judgment on the appeals will determine the financial result.

The Commission describes its December 2025 decision as the first noncompliance decision under the Digital Services Act. The Justice Department says the appeals are the first challenge to an enforcement action under that law to reach the General Court. That gives the dispute potential significance for other large platforms operating in Europe, particularly on transparency duties and the identification of a service provider. The reach of any eventual judgment will depend on its precise reasoning, rather than on the US request to participate. The Commission maintains that it found specific breaches, while Washington objects to the breadth of liability in the decision.

The next step is for the court to consider the US application and continue hearing the challenges brought by X and Musk. The Justice Department notes that the court’s rules require a party seeking to intervene to establish an interest in the outcome. If the request is granted, US arguments can become part of the litigation without that decision resolving the underlying fine. The decisive question later will be whether the court upholds, changes or annuls the Commission’s findings on transparency, liability and the penalty’s calculation. Until a ruling changes it, €120 million remains the fine stated in the Commission decision under appeal.