Whether Congress's power under Section 5 of the Fourteenth Amendment permits it to define the substantive scope of the Free Exercise Clause more broadly than the Court had defined it in Employment Division v. Smith.
Holding
No. Section 5 permits Congress to enforce the Fourteenth Amendment's guarantees through remedial or preventive legislation, but it does not permit Congress to redefine those guarantees or alter the Court's interpretation of the Constitution.
Reasoning
The Court accepted that the Fourteenth Amendment incorporates the Free Exercise Clause against the States through the Due Process Clause. Congress therefore may enact appropriate legislation to prevent or remedy state violations of free-exercise rights. But Section 5 grants a power to "enforce," not a power to determine independently what the Fourteenth Amendment means or what conduct violates it.
The text, history, and structure of the Fourteenth Amendment supported a remedial understanding of Section 5. The Court emphasized that an early Reconstruction-era proposal would have given Congress broad authority to legislate directly concerning life, liberty, and property, but that proposal was rejected because it threatened to centralize power at the expense of the States. The ratified Amendment instead imposed self-executing constitutional limits on States and gave Congress power to make those limits effective.
The Court's precedents likewise distinguish valid enforcement legislation from an impermissible substantive revision of constitutional rights. Congress may sometimes prohibit conduct that is not itself unconstitutional in order to deter or remedy actual constitutional violations, as the voting-rights cases demonstrate. But Congress cannot use Section 5 to change the meaning of the constitutional right it purports to enforce; otherwise, ordinary legislation could effectively amend the Constitution without following Article V, and Congress would displace the Judiciary's role in deciding constitutional cases.