24 States and DC Sue DHS Over Use of Welfare Data in Immigration Cases
24 states and DC sued DHS to stop use of TANF welfare data in immigration enforcement cases.
Why it matters: Legal teams advising state and federal entities face complex compliance challenges as privacy and state sovereignty collide in DHS’s data use for immigration enforcement.
- The lawsuit, filed August 3, 2026, in DC Superior Court, includes 24 states and DC.
- It challenges DHS’s use of Temporary Assistance for Needy Families (TANF) data for immigration enforcement, alleging illegal repurposing.
- Plaintiffs argue DHS’s data use violates state control and privacy protections under federalism principles.
- In 2025, HHS transferred Medicaid data from California, Illinois, Washington, and DC to DHS without state consent, intensifying concerns.
- A 2025 Government Accountability Office report highlighted state challenges managing welfare program data accuracy and privacy.
On August 3, 2026, officials from 24 states plus the District of Columbia filed a lawsuit in the DC Superior Court against the Department of Homeland Security (DHS), seeking to block DHS's use of welfare data from the Temporary Assistance for Needy Families (TANF) program in immigration enforcement. The plaintiffs argue this use constitutes unlawful repurposing of sensitive anti-poverty aid data.
The states and DC contend that DHS accessing TANF data infringes privacy rights and violates state sovereignty, asserting that federalism principles protect states’ control over personal welfare information shared for specific social service purposes. This litigation follows a controversial 2025 incident when the Department of Health and Human Services (HHS) transferred Medicaid data—including addresses, social security numbers, immigration status, and health records of millions of individuals—from California, Illinois, Washington, and DC to DHS without obtaining state consent. HHS political appointees authorized this transfer despite objections from career staff due to legal concerns.
Although the current lawsuit concerns TANF data—which relates to anti-poverty financial assistance and distinct from Medicaid—the prior unauthorized Medicaid data transfer has heightened states' wariness about federal access to welfare program data. Medicaid enrollment information includes both assistance-related and linked personal data, while TANF non-assistance data refers to administrative data like participant demographics and service provider information.
A 2025 Government Accountability Office report detailed challenges states face managing TANF non-assistance data, including data matching difficulties across systems and limited outcome measurement reliability, complicating states' ability to ensure data privacy and program effectiveness.
This suit reflects ongoing tension between federal immigration enforcement priorities and states' interests in safeguarding the privacy of social service recipients and maintaining jurisdiction over such data. Legal professionals advising both government and private sector clients should watch this case for its potential impact on data privacy compliance frameworks and the delineation of federal vs. state authority over welfare data.
By the numbers:
- 24 states plus DC — plaintiffs in the August 2026 lawsuit
- 2025 — year of the Medicaid data transfer from four jurisdictions to DHS
- Millions — individuals whose Medicaid data was transferred without state consent
Yes, but: While the lawsuit focuses on TANF data, prior issues with unauthorized Medicaid data transfers complicate the legal and operational context but involve different data categories and legal frameworks.
What's next: The case will proceed in DC Superior Court; legal observers expect arguments over federalism and privacy rights to shape future federal-state data governance policies.