cross-posted from the Pennsylvania Tenth Amendment Center
If the power to nullify an unconstitutional law is prohibited to the states, it can be prohibited in one, and only one, place — The Constitution. This fact leads to a simple question which can settle the debate. “Where is the text in the Constitution that prohibits nullification?” If that text can’t be found, then nullification cannot possibly be prohibited. (Hint, there”s no such prohibition in Article I, Section X).