US DOJ backs xAI lawsuit against Colorado’s AI regulation

TL;DR:

• The US Justice Department has intervened in xAI’s lawsuit challenging Colorado SB 24-205, the state’s AI regulation due to take effect on 30 June.
• The DOJ argues the law violates 14th Amendment equal-protection guarantees by limiting unintended discriminatory effects while permitting positive-discrimination measures.
• For UK readers, the case is a useful marker for the Trump administration’s stated preference for a single federal AI framework — and for what it means for UK firms operating in the US patchwork.

The US Department of Justice has intervened in Elon Musk’s xAI lawsuit challenging Colorado’s AI regulation law, according to The Guardian. The intervention escalates a single-company legal challenge into a direct confrontation between the Trump administration and a state attempting to impose its own AI rules.

The Colorado law, Senate Bill 24-205, is scheduled to take effect on 30 June. It imposes disclosure and risk-mitigation requirements on developers of “high-risk” AI systems used in decisions about employment, housing, education, healthcare and financial services. xAI argued in its earlier complaint that the law violates the First Amendment by restricting AI system design and compelling speech on contentious public issues. The DOJ’s intervention now adds a 14th Amendment equal-protection argument: that requiring companies to mitigate unintended discrimination while permitting some discrimination intended to promote diversity is itself unconstitutional. “Laws that require AI companies to infect their products with woke DEI ideology are illegal,” said Harmeet Dhillon, the assistant attorney general for civil rights. The Colorado attorney general’s office declined to comment.

What this signals

The intervention is a more aggressive federal posture than even the Texas-led state-coalition push to block separate state AI laws over the past year. The Trump administration has been pushing for a single legislative framework governing AI applied uniformly across the US, rather than allowing states to set their own rules — and the Colorado challenge is the case it has chosen to push first.

For UK-headquartered firms with US operations, the immediate practical question is whether the Colorado law actually takes effect on 30 June or whether the lawsuit secures an injunction first. UK readers tracking the wider transatlantic regulatory pattern will note that this US move toward unified federal AI rules contrasts directly with this week’s UK story of ministers resisting EU rule alignment to keep regulatory flexibility. Both jurisdictions are reaching for “single framework” outcomes, but for opposite reasons: Washington to restrict state-level rule-making; London to retain freedom to diverge.

Looking forward

The Colorado case will be the first significant US court test of whether AI regulation can survive both First Amendment and 14th Amendment challenges. If the DOJ wins, other state-level AI bills in the legislative pipeline will face similar federal opposition. UK firms with US deployments should watch the case primarily as a forecast: it tells you whether your US compliance work needs to plan for state-by-state heterogeneity through 2026, or whether one federal regime is more likely to consolidate by year-end.