The parties are directed to brief and argue the following additional question: Whether the Secretary of Commerce's decision to add a citizenship question to the Decennial Census violated the Enumeration Clause of the U.S. Constitution, art. I, § 2, cl. 3. Respondents are allowed an additional 2,000 words in aggregate to address this question in their briefs on the merits. Petitioners are allowed an additional 1,000 words to address this question in their reply brief on the merits.