This essay by Joe Wolverton II addresses the issue of state nullification as put forth by Thomas Jefferson and James Madison in their Kentucky and Virginia Resolutions.  Simply stated, state nullification theory argues that state courts must have the power to declare federal laws unconstitutional.  It was the states, after all, that created the federal government.  The federal government cannot be the final arbiter of its own laws.  As the federal government is a creation of the states, only the states can have the power to judge the constitutionality of federal laws.

https://www.thenewamerican.com/usnews/constitution/item/11158-the-case-for-nullification