Congress may not authorize the States to violate the Fourteenth Amendment. 'Congress is without power to enlist state cooperation in a joint federal-state program by legislation which authorizes the States to violate the Equal Protection Clause.' Shapiro v. Thompson, 394 U. S. 618, 641 (1969).' Townsend v. Swank, 404 U. S. 282, 291 (1971). Moreover, the protection afforded to the citizen by the Citizenship Clause of that Amendment is a limitation on the powers of the National Government as well as the States.
Article I of the Constitution grants Congress broad power to legislate in certain areas. Those legislative powers are, however, limited not only by the scope of the Framers' affirmative delegation, but also by the principle 'that they may not be exercised in a way that violates other specific provisions of the Constitution. For example, Congress is granted broad power to 'lay and collect Taxes,' but the taxing power, broad as it is, may not be invoked in such a way as to violate the privilege against self-incrimination.' Williams v. Rhodes, 393 U. S. 23, 29 (1968) (footnote omitted). Congress has no affirmative power to authorize the States to violate the Fourteenth Amendment and ...