Kentucky and Mississippi have a joined a lawsuit challenging a directive by the Obama administration advising schools to allow transgender students to use the bathroom of their choice.

Both states are listed in an amended complaint filed this week.

The lawsuit, announced late last month, is led by Texas. Other participants in the lawsuit include Alabama, Georgia, Louisiana, Oklahoma, Tennessee, Utah, West Virginia and Wisconsin, as well as Maine Governor Paul LePage, a Republican.

Plaintiffs argue in their lawsuit that the federal government has “conspired to turn workplace and educational settings across the country into laboratories for a massive social experiment, flouting the democratic process, and running roughshod over commonsense policies protecting children and basic privacy rights. Defendants' rewriting of Title VII and Title IX is wholely incompatible with Congressional text. Defendants cannot foist these radical changes on the nation.”

(Related: Eleven states sue Obama administration over student transgender bathroom use.)