To confer standing on State legislators and Governors to bring suit in Federal district court to preserve the residual core sovereignty of States under the Constitution as expressed in the Tenth Amendment, and to enforce the Guarantee Clause of the Constitution.

Confers standing on any member of a state legislative body (upon the adoption of a resolution by the body authorizing suit on the state's behalf) and on the governor of a state to bring an action on the ground that a federal statute, rule, regulation, or program: (1) violates the residual core sovereign authority of the state under the Tenth Amendment of the Constitution; or (2) diminishes the republican form of government in the state.