"the Supreme Court ruled that the IEEPA does not authorise the president to impose blanket tariffs, as Trump had argued" [IEEPA]
The Supreme Court's IEEPA ruling directly illustrates the judicial mechanism constraining executive tariff authority, forcing the administration into the narrower Section 122 route now also under challenge.
Reasoning from this article
The article shows a sequential pattern: IEEPA tariffs struck down, administration pivots to Section 122, Section 122 tariffs also ruled unauthorized by the lower court. This is not an isolated event but a structural dynamic in which courts are systematically narrowing the legal space for unilateral executive trade action. The same dynamic would apply to any future administration attempting to use emergency or statutory authorities for sweeping tariffs, making this a durable constraint on executive trade power rather than a Trump-specific outcome.