A civil rights group has sued 12 New Jersey school districts over enrollment practices that it says discriminates against children of immigrants who are living in the country illegally.

The American Civil Liberties Union of New Jersey said in the lawsuit that the districts require forms of state-issued identification that can only be obtained by someone who is a citizen or has a Social Security number.

“New Jersey’s state Constitution calls for free public education, and that applies to every single child – no exceptions,” said ACLU-NJ staff attorney Elyla Huertas in a statement. Huertas was the one who filed the lawsuit.

The districts are spread across the state, and includes one charter school district. The ACLU says the selected districts have the most restrictive policies, but that several others in the state also impose improper requirements.

“Public schools exist to educate all of a community’s children. The stakes are too high to allow these unlawful and discriminatory policies to continue, especially here, especially now,” ACLU-NJ executive director Amol Sinha said in a statement.

The ACLU has previously sued 13 other New Jersey districts in recent years over similar disputes. All those suits were settled after the districts agreed to change their policies.