The Lawfare Podcast Rational Security: The “Off the Rails” Edition
Feb 26, 2026
Paul Stephan, University of Virginia law professor known for his work on international economic powers, offers crisp legal analysis. He breaks down the Supreme Court ruling limiting IEEPA tariff authority. He analyzes whether tariffs can be reimposed under other statutes. He also discusses the legal and diplomatic fallout from Mexico’s strike on El Mencho and the cartel retaliation.
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Major Questions Doctrine Still Up For Grabs
- The major questions doctrine remains unsettled: six justices used it rhetorically but disagreed on its scope and application.
- Paul Stephan noted the doctrine functions as a gap-filler when textual priors are ambiguous, so its future utility is unclear.
Foreign Affairs Argument Has Narrow Limits
- The Court rejected treating all outward-facing executive actions as inherently within presidential foreign-affairs power.
- Paul Stephan cautioned that if everything qualified as foreign affairs, the executive's authority would become maximal and unchecked.
Existing Trade Statutes Constrain New Tariffs
- Alternative statutory routes (Title 19 sections like balance of payments and Section 232) constrain Trump's tariff playbook with explicit limits: e.g., 15% caps and 150-day durations.
- Paul Stephan warned these are less flexible and slower than IEEPA, reducing surprise and bargaining leverage.
