Cite as: 588 U. S. ____ (2019) 9 Opinion of the Court tions” for Members of Congress, while giving Congress the power to “make or alter” any such regulations. Whether to give that supervisory authority to the National Government was debated at the Constitutional Convention. When those opposed to such congressional oversight moved to strike the relevant language, Madison came to its defense: “[T]he State Legislatures will sometimes fail or refuse to consult the common interest at the expense of their local coveniency or prejudices. . . . Whenever the State Legislatures had a favorite measure to carry, they would take care so to mould their regulations as to favor the candidates they wished to succeed.” 2 Records of the Federal Convention of 1787, at 240– 241. During the subsequent fight for ratification, the provision remained a subject of debate. Antifederalists predicted that Congress’s power under the Elections Clause would allow Congress to make itself “omnipotent,” setting the “time” of elections as never or the “place” in difficult to reach corners of the State. Federalists responded that, among other justifications, the revisionary power was necessary to counter state legislatures set on undermining fair representation, including through malapportionment. M. Klarman, The Framers’ Coup: The Making of the United States Constitution 340–342 (2016). The Federalists were, for example, concerned that newly developing population centers would be deprived of their proper electoral weight, as some cities had been in Great Britain. See 6 The Documentary History of the Ratification of the Constitution: Massachusetts 1278–1279 (J. Kaminski & G. Saladino eds. 2000). Congress has regularly exercised its Elections Clause power, including to address partisan gerrymandering. The Apportionment Act of 1842, which required single-