Medicaid officials improperly shared data about millions of people with ICE in January 2026, which ICE then transferred to the data analytics firm Palantir without authorization. The data included information on U.S. citizens and legal immigrants, exceeding what a federal court order permitted. ICE was supposed to delete the improperly shared data, but discovered that multiple users still retained copies of the dataset. The revelation emerged in court filings by Democratic attorneys general challenging ICE's access to Medicaid data for deportation efforts.