The term “Supreme Court Intergovernmental” likely refers to the concept of intergovernmental immunity as established and interpreted by the United States Supreme Court.
Intergovernmental immunity is a doctrine in United States Constitutional Law that prevents the federal government and individual state governments from intruding on each other’s sovereignty1. This principle was established by the U.S. Supreme Court in the case of McCulloch v. Maryland in 18192. In this case, the Supreme Court ruled unanimously that states may not regulate property or operations of the federal government2.
The doctrine is also referred to as a Supremacy Clause immunity or simply federal immunity from state law1. It is an important aspect of public international law and is meant to govern the behavior of states and other actors in the international system3.
For example, in the case of United States v. Washington, Justice Stephen Breyer authored the unanimous opinion of the Court stating that the Supremacy Clause prohibits states from interfering with or controlling the operations of the federal government4. This is an application of the intergovernmental immunity doctrine4.