A coalition of 19 states sued the Trump administration on Friday over its threat to withhold federal funding from states and districts with certain diversity programs in their public schools.

The lawsuit was filed in federal court by the attorneys general in California, New York, Illinois, Minnesota and other Democratic-leaning states, who argue that the Trump administration’s demand is illegal.

The lawsuit centers on an April 3 memo the Trump administration sent to states, requiring them to certify that they do not use certain diversity, equity and inclusion programs that the administration has said are illegal.