A bipartisan group of congressmen represented by law professor Jonathan Turley filed suit in federal court in Washington, D.C., Wednesday to try to invalidate the legal underpinnings of U.S. involvement in Libya.

The lawsuit is a rare attempt to litigate the war powers of the U.S. Constitution, including Congress’ power to declare war and the president’s authority as commander in chief of the armed forces. It comes as the Obama administration is under pressure from an even broader group of lawmakers who want to know more about its rationale for armed force in Libya.