The idea that no law in the United States can continue to exist if it conflicts with the Constitution is called what?

The idea that no law in the United States can continue to exist if it conflicts with the Constitution is called constitutional supremacy or more commonly, the doctrine of supremacy clause. This principle is derived from Article VI, Clause 2 of the United States Constitution, which asserts that the Constitution, along with federal laws made pursuant to it, is the supreme law of the land. This means that when state laws or even federal laws are in conflict with the Constitution, those laws are invalid. The supremacy clause ensures that the Constitution prevails and provides a framework for judicial review, where courts have the authority to evaluate the constitutionality of laws. Thus, any legislation or state action that contradicts constitutional provisions can be challenged in court and potentially deemed unconstitutional.