Cite as: 531 U. S. 356 (2001)
Opinion of the Court
Section 1 of the Fourteenth Amendment provides, in relevant part:
"No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws."
Section 5 of the Fourteenth Amendment grants Congress the power to enforce the substantive guarantees contained in § 1 by enacting "appropriate legislation." See City of Boerne v. Flores, 521 U. S. 507, 536 (1997). Congress is not limited to mere legislative repetition of this Court's constitutional jurisprudence. "Rather, Congress' power 'to enforce' the Amendment includes the authority both to remedy and to deter violation of rights guaranteed thereunder by prohibiting a somewhat broader swath of conduct, including that which is not itself forbidden by the Amendment's text." Kimel, supra, at 81; City of Boerne, supra, at 536.
City of Boerne also confirmed, however, the long-settled principle that it is the responsibility of this Court, not Congress, to define the substance of constitutional guarantees. 521 U. S., at 519-524. Accordingly, § 5 legislation reaching beyond the scope of § 1's actual guarantees must exhibit "congruence and proportionality between the injury to be prevented or remedied and the means adopted to that end." Id., at 520.
II
The first step in applying these now familiar principles is to identify with some precision the scope of the constitutional right at issue. Here, that inquiry requires us to examine the limitations § 1 of the Fourteenth Amendment places upon States' treatment of the disabled. As we did last Term in Kimel, see 528 U. S., at 83, we look to our prior decisions under the Equal Protection Clause dealing with this issue.
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