Well sure, when political reality stands in the way of some self-serving doctrine about legal rebellion, it's all a bunch of BS. But you still have the Constitution backwards. It's a fundamental law enacted by the people of the US. No one else can alter or abolish it, or the more perfect Union and government it in turn establishes, unless the sovereign people grant them such authority via the Constitution. If it ain't there, it ain't constitutional, and unilateral secession ain't there. Works the same for the Union as it does for the states.
However, if a lack of political know-how leaves that unclear, any and all unilateral state interference with the Fed in the performance of its constitutional responsibilities is prohibited: "This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any thing in the Constitution or Laws of any State to the Contrary notwithstanding."
And then there's that Tenth Amendment: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."