California Attorney General Rob Bonta led 20 states in a lawsuit on Tuesday alleging the Trump administration unlawfully shared public health insurance information with Immigration and Customs Enforcement officials.

The lawsuit argues that federal law only allows states and the federal government to share Medicaid enrollees’ personal data if necessary to run the program or to identify fraud.

The data sharing violates the Medicaid Act, the attorneys general said, which allows sharing of personal information only in narrow circumstances that benefit public health and the integrity of the Medicaid program.