Syllabus
In sum, the Secretary’s comprehensive debt cancellation plan is not a waiver because it augments and expands existing provisions dramatically. It is not a modification because it constitutes “effectively the introduction of a whole new regime.” MCI, 512 U. S., at 234. And it cannot be some combination of the two, because when the Secretary seeks to add to existing law, the fact that he has “waived” certain provisions does not give him a free pass to avoid the limits inherent in the power to “modify.” However broad the meaning of “waive or modify,” that language cannot authorize the kind of exhaustive rewriting of the statute that has taken place here. Pp. 13–18.
(b) The Secretary also appeals to congressional purpose, arguing that Congress intended “to grant substantial discretion to the Secretary to respond to unforeseen emergencies.” On this view, the unprecedented nature of the Secretary’s debt cancellation plan is justified by the pandemic’s unparalleled scope. But the question here is not whether something should be done; it is who has the authority to do it. As in the Court’s recent decision in West Virginia v. EPA, given the “ ‘history and the breadth of the authority’ ” asserted by the Executive and the “ ‘economic and political significance’ of that assertion,” the Court has “ ‘reason to hesitate before concluding that Congress’ meant to confer such authority.” 597 U. S. ___, ___ (quoting FDA v. Brown & Williamson Tobacco Corp., 529 U. S. 120, 159–160).