The International Emergency Economic Powers Act (IEEPA), enacted in 1977, allows presidents to declare national emergencies and freeze assets, block transactions, or regulate commerce with foreign entities and individuals. Congress passed IEEPA to constrain unchecked emergency powers that had expanded for decades after 1933 without explicit statutory limits.
The statute requires emergencies to involve threats "originating in whole or substantial part outside the United States." Presidents have used IEEPA to impose economic sanctions on Iran, North Korea, Russia, and other adversaries. However, courts have rejected president's attempts to use IEEPA for tariffs—the statute authorizes asset freezes and transaction blocks, not import duties. Trump invoked IEEPA for tariffs on Feb. 1, 2026; the Supreme Court struck them down on Feb. 20. Over 1,000 affected businesses sued for $133 billion in refunds.
IEEPA remains the primary legal tool for executive-branch sanctions but has limits—Congress retains authority to revoke emergency declarations by a majority vote in both chambers.
IEEPA shows how presidents wield vast foreign policy power during crises without congressional approval. The scope of "emergency" and "national security" is contested and shapes America's ability to sanction adversaries unilaterally.
People think IEEPA lets presidents impose tariffs. It doesn't—courts have held it authorizes only asset freezes and transaction blocks, not import duties.
IEEPA shows how presidents wield vast foreign policy power during crises without congressional approval. The scope of "emergency" and "national security" is contested and shapes America's ability to sanction adversaries unilaterally.
People think IEEPA lets presidents impose tariffs. It doesn't—courts have held it authorizes only asset freezes and transaction blocks, not import duties.