As she prepared to leave, the folks had no choice but to shout out their questions and comments in hope their voices would be heard. But not to be bothered by actually listening to the people she claims to represent, Ms. Castor left the room with her security officer.

See also The Federalist No. 28, at 180-181 (A. Hamilton). The power of the Federal Government would be augmented immeasurably if it were able to impress into its service-and at no cost to itself-the police officers of the 50 States. Calabresi & Prakash, The President's Power to Execute the Laws, 104 Yale L. J. 541 (1994). That unity would be shattered, and the power of the President would be subject to reduction, if Congress could act as effectively without the President as with him, by simply requiring state officers to execute its laws.

What destroys the dissent's Necessary and Proper Clause argument, however, is not the Tenth Amendment but the Necessary and Proper Clause itself. When a "La[w] . . . for carrying into Execution" the Commerce Clause violates the principle of state sovereignty reflected in the various constitutional provisions

we mentioned earlier, supra, at 919, it is not a "La[w] . . . proper for carrying into Execution the Commerce Clause," and is thus, in the words of The Federalist, "merely [an] ac[t] of usurpation" which "deserve[s] to be treated as such." The Federalist No. 33, at 204 (A. Hamilton). See Lawson & Granger, The "Proper" Scope of Federal Power: A Jurisdictional Interpretation of the Sweeping Clause, 43 Duke L. J. 267, 297-326, 330-333 (1993). We in fact answered the dissent's Necessary and Proper Clause argument in New York:

"[E]ven where Congress has the authority under the Constitution to pass laws requiring or prohibiting certain acts, it lacks the power directly to compel the States to require or prohibit those acts. . . . [T]he Commerce Clause, for example, authorizes Congress to regulate interstate commerce directly; it does not authorize Congress to regulate state governments' regulation of interstate commerce." 505 U. S., at 166.

Finally, and most conclusively in the present litigation, we turn to the prior jurisprudence of this Court. Federal commandeering of state governments is such a novel phenomenon that this Court's first experience with it did not occur until the 1970's, when the Environmental Protection Agency promulgated regulations requiring States to prescribe auto emissions testing, monitoring and retrofit programs, and to

designate preferential bus and carpool lanes. The Courts of Appeals for the Fourth and Ninth Circuits invalidated the regulations on statutory grounds in order to avoid what they perceived to be grave constitutional issues, see Maryland v. EPA, 530 F. 2d 215, 226 (CA4 1975); Brown v. EPA, 521 F. 2d

827, 838-842 (CA9 1975); and the District of Columbia Circuit invalidated the regulations on both constitutional and statutory grounds, see District of Columbia v. Train, 521 F. 2d 971, 994 (1975). After we granted certiorari to review the statutory and constitutional validity of the regulations, the Government declined even to defend them, and instead rescinded some and conceded the invalidity of those that remained, leading us to vacate the opinions below and remand for consideration of mootness. EPA v. Brown, 431 U. S. 99 (1977) (per curiam).

Although we had no occasion to pass upon the subject in Brown, later opinions of ours have made clear that the Federal Government may not compel the States to implement, by legislation or executive action, federal regulatory programs. In Hodel v. Virginia Surface Mining & Reclamation Assn., Inc., 452 U. S. 264 (1981), and FERC v. Mississippi, 456 U. S. 742 (1982), we sustained statutes against constitutional challenge only after assuring ourselves that they did not require the States to enforce federal law.

When we were at last confronted squarely with a federal statute that unambiguously required the States to enact or administer a federal regulatory program, our decision should have come as no surprise. At issue in New York v. United States, 505 U. S. 144 (1992), were the so-called "take title" provisions of the Low-Level Radioactive Waste Policy Amendments Act of 1985, which required States either to enact legislation providing for the disposal of radioactive waste generated within their borders, or to take title to, and possession of, the waste-effectively requiring the States either to legislate pursuant to Congress's directions, or to implement an administrative solution. Id., at 175-176. We concluded that Congress could constitutionally require the States to do neither. Id., at 176. "The Federal Government," we held, "may not compel the States to enact or administer a federal regulatory program." Id., at 188.

The Government's distinction between "making" law and merely "enforcing" it, between "policymaking" and mere "implementation," is an interesting one. It is perhaps not meant to be the same as, but it is surely reminiscent of, the line that separates proper congressional conferral of Executive power from unconstitutional delegation of legislative authority for federal separation-of-powers purposes. See A. L. A. Schechter Poultry Corp. v. United States, 295 U. S. 495, 530 (1935); Panama Refining Co. v. Ryan, 293 U. S. 388, 428-429 (1935).

Is this decision whether to devote maximum "reasonable efforts" or minimum "reasonable efforts" not preeminently a matter of policy? It is quite impossible, in short, to draw the Government's proposed line at "no policymaking," and we would have to fall back upon a line of "not too much policymaking." How much is too much is not likely to be answered precisely; and an imprecise barrier against federal intrusion upon state authority is not likely to be an effective one.

...we fail to see how that improves rather than worsens the intrusion upon state sovereignty. Preservation of the States as independent and autonomous political entities is arguably less undermined by requiring them to make policy in certain fields than (as Judge Sneed aptly described it over two decades ago) by "reduc[ing] [them] to puppets of a ventriloquist Congress," Brown v. EPA, 521 F. 2d, at 839.

It is an essential attribute of the States' retained sovereignty that they remain independent and autonomous within their proper sphere of authority. See Texas v. White, 7 Wall., at 725. It is no more compatible with this independence and autonomy that their officers be "dragooned" (as Judge Fernandez put it in his dissent below, 66 F. 3d, at 1035) into administering federal law, than it would be compatible with the independence and autonomy of the United States that its officers be impressed into service for the execution of state laws.

This argument fails even on its own terms. By forcing state governments to absorb the financial burden of implementing a federal regulatory program, Members ofCongress can take credit for "solving" problems without having to ask their constituents to pay for the solutions with higher federal taxes. And even when the States are not forced to absorb the costs of implementing a federal program, they are still put in the position of taking the blame for its burdensomeness and for its defects. See Merritt, Three Faces of Federalism: Finding a Formula for the Future, 47Vand. L. Rev. 1563, 1580, n. 65 (1994).

To say that the Federal Government cannot control the State, but can control all of its officers, is to say nothing of significance. Indeed, it merits the description "empty formalistic reasoning of the highest order," post, at 952.

"...and places a minimal and only temporary burden upon state officers." There is considerable disagreement over the extent of theburden, but we need not pause over that detail. Assuming all the mentioned factors were true, they might be relevant if we were evaluating whether the incidental application to the States of a federal law of general applicability excessively

interfered with the functioning of state governments. See, e. g., Fry v. United States, 421 U. S. 542, 548 (1975); National

League of Cities v. Usery, 426 U. S. 833, 853 (1976) (overruled by Garcia v. San Antonio Metropolitan Transit Authority, 469 U. S. 528 (1985)); South Carolina v. Baker, 485 U. S. 505, 529 (1988) (Rehnquist, C. J., concurring in judgment).

But where, as here, it is the whole object of the law to direct the functioning of the state executive, and hence to compromise the structural framework of dual sovereignty, such a "balancing" analysis is inappropriate. It is the very principle of separate state sovereignty that such a law offends, and no comparative assessment of the various interests can overcome that fundamental defect. Cf. Bowsher, 478 U. S., at 736 (declining to subject principle of separation of powers to a balancing test); Chadha, 462 U. S., at 944-946 (same); Plaut v. Spendthrift Farm, Inc., 514 U. S. 211, 239-240 (1995) (holding legislated invalidation of final judgments to be categorically unconstitutional).

"Much of the Constitution is concerned with setting forth the form of our government, and the courts have traditionally invalidated measures deviating from that form. The result may appear ‘formalistic' in a given case to partisans of the measure at issue, because such measures are typically the product of the era's perceived necessity. But the Constitution protects us from our own best intentions: It divides power among sovereigns and among branches of government precisely so that we may resist the temptation to concentrate power in one

location as an expedient solution to the crisis of the day." 505 U. S., at 187.

We adhere to that principle today, and conclude categorically, as we concluded categorically in New York: "The Federal Government may not compel the States to enact or administer a federal regulatory program." Id., at 188. We held in New York that Congress cannot compel the States to enact or enforce a federal regulatory program. Today we hold that Congress cannot circumvent that prohibition by conscripting the States' officers directly. The Federal Government may neither issue directives requiring the States to address particular problems, nor command the States' officers, or those of their political subdivisions, to administer or enforce a federal regulatory program. It matters not whether policymaking is involved, and no case-bycase weighing of the burdens or benefits is necessary; such commands are fundamentally incompatible with our constitutional system of dual sovereignty. Justice O.Connor No. 95-1478. Argued December 3, 1996-Decided June 27, 1997
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