Cite as: 531 U. S. 457 (2001)
Opinion of Stevens, J.
cern that there may nevertheless be a genuine constitutional problem with § 109, a problem which the parties did not address.
The parties to these cases who briefed the constitutional issue wrangled over constitutional doctrine with barely a nod to the text of the Constitution. Although this Court since 1928 has treated the "intelligible principle" requirement as the only constitutional limit on congressional grants of power to administrative agencies, see J. W. Hampton, Jr., & Co. v. United States, 276 U. S. 394, 409 (1928), the Constitution does not speak of "intelligible principles." Rather, it speaks in much simpler terms: "All legislative Powers herein granted shall be vested in a Congress." U. S. Const., Art. 1, § 1 (emphasis added). I am not convinced that the intelligible principle doctrine serves to prevent all cessions of legislative power. I believe that there are cases in which the principle is intelligible and yet the significance of the delegated decision is simply too great for the decision to be called anything other than "legislative."
As it is, none of the parties to these cases has examined the text of the Constitution or asked us to reconsider our precedents on cessions of legislative power. On a future day, however, I would be willing to address the question whether our delegation jurisprudence has strayed too far from our Founders' understanding of separation of powers.
Justice Stevens, with whom Justice Souter joins, concurring in part and concurring in the judgment.
Section 109(b)(1) delegates to the Administrator of the Environmental Protection Agency (EPA) the authority to promulgate national ambient air quality standards (NAAQS). In Part III of its opinion, ante, at 472-476, the Court convincingly explains why the Court of Appeals erred when it concluded that § 109 effected "an unconstitutional delegation of legislative power." American Trucking Assns., Inc. v. EPA, 175 F. 3d 1027, 1033 (CADC 1999) (per curiam).
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