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US Justice Department joins lawsuit to block Colorado's AI anti-discrimination law
The US Department of Justice has joined a lawsuit to block Colorado's AI discrimination law before it takes effect June 30. It's the first time the federal government has intervened against a state AI regulation.
Federal government joins lawsuit challenging Colorado's AI discrimination law
The US Department of Justice filed papers this week to block Colorado's Anti-Discrimination in AI Act from taking effect on June 30, joining a lawsuit originally brought by Elon Musk's xAI. The move marks the first time the federal government has intervened in a lawsuit challenging a state AI regulation, and signals an accelerating effort to dismantle fairness-focused rules in American workplaces.
Colorado's law, signed in May 2024, requires companies to conduct impact assessments on AI tools used in hiring, performance evaluation and other employment decisions. It covers any organisation deploying such tools in the state, regardless of size. Employers must issue transparency notices to affected workers and report discriminatory outcomes to the state's Attorney General.
The law defines algorithmic discrimination broadly, covering differential treatment based on age, disability, ethnicity, race, religion, sex, veteran status and other protected characteristics.
The federal argument
xAI filed its initial challenge on April 9, arguing the law violated the First Amendment by compelling developers to redesign AI systems to avoid disparate outcomes - a form of government-mandated speech, the company said. The company also claimed the law was unconstitutionally vague and would burden interstate commerce.
The Justice Department's filing added a constitutional dimension centred on the Fourteenth Amendment. The DOJ argued that the law "effectively forces AI companies to make decisions on the basis of race, sex and religion" to satisfy its requirements.
Harmeet K. Dhillon, the Assistant Attorney General for Civil Rights, said laws requiring AI companies to incorporate what she called "woke DEI ideology" into their products are illegal. The filing argued the law "jeopardises the United States' position as the global AI leader."
The administration has singled out Colorado's law specifically. In December 2025, the President signed an executive order identifying the state's AI Act by name as an example of state-level regulation embedding ideological bias into technology - the only state AI law mentioned in that order.
A broader federal strategy
The Colorado case is one piece of a larger federal effort. Since January 2025, the Trump administration has issued executive orders dismantling federal diversity programmes, directing agencies to investigate private-sector diversity initiatives, and threatening federal contracts for companies maintaining certain equity-focused policies.
The Justice Department's willingness to enter litigation suggests a sustained strategy. The administration views state-level AI regulation as an obstacle to US technological competitiveness.
The international contrast
The divergence with other jurisdictions is stark. The European Union's AI Act, in enforcement since 2024 and 2025, imposes broadly analogous requirements on employment-related AI systems and applies across all EU member states. The UK has maintained that existing equality law applies to AI-assisted employment decisions. Canada, Australia and several Asian jurisdictions are developing comparable frameworks.
For multinationals, the gap creates genuine complexity. An AI screening tool that must meet fairness standards in Frankfurt or London may now face legal exposure for attempting to meet equivalent standards in Denver.
What HR professionals should do now
Review your AI vendors' US compliance posture. If your organisation uses AI tools from US-based developers for applicant tracking, skills assessment, performance management or workforce planning, those vendors are operating in an uncertain legal environment. Understand how they are responding to both Colorado's law and the federal challenge.
Audit your global AI governance framework for US exposure. Many multinationals have developed global AI ethics or fairness policies aligned with EU or UK expectations. Those frameworks may include bias testing, impact assessments and diversity-sensitive design - provisions now being characterised by the US federal government as legally suspect when applied in America. Have legal counsel review whether those provisions create risk under the emerging US framework.
Monitor the broader federal direction. The Colorado lawsuit is unlikely to be the last. The administration has made clear it views state-level AI regulation as an obstacle, and the DOJ's litigation strategy suggests sustained action. Track not only this case but any further executive or legislative action at the federal level that may preempt state AI laws.
Do not abandon Colorado compliance preparation. Courts move slowly, and an injunction blocking the law before June 30 is not guaranteed. Organisations with Colorado operations should continue preparing for compliance while monitoring litigation. The law's transparency and impact assessment requirements represent sound governance practice regardless of their legal status.
Prepare for questions from staff and stakeholders. In many countries, employees and institutional investors expect organisations to demonstrate commitment to fairness in AI-assisted decision-making. The US legal environment is shifting, but reputational expectations - particularly in Europe - are not. HR leaders may find themselves navigating a gap between what US law permits and what global stakeholders demand.
What comes next
The case, xAI v. Weiser, is proceeding in the US District Court for the District of Colorado. The law remains scheduled to take effect on June 30 unless a court issues an injunction. The Colorado legislature has until May 13 to pass amendments that could reduce compliance burden - though whether such amendments would satisfy the federal government's constitutional objections is unclear.
The broader question remains: will the United States develop a coherent national approach to AI in the workplace, or will the field remain a patchwork of state laws contested by a federal administration that has made dismantling fairness-focused regulation a central priority?
For international HR professionals accustomed to predictable regulatory frameworks, the uncertainty itself is the message. The United States is engaged in a fundamental argument about what fairness in the workplace means - and who gets to define it.
Disclaimer: This article is provided for informational purposes only and does not constitute legal advice. Organisations should seek qualified counsel in all relevant jurisdictions.