Supreme Court Strikes Down Trump Tariffs, Leaving Trade Deals in Flux
In a significant ruling with global implications, the United States Supreme Court on February 20, 2026, struck down sweeping tariffs imposed by former President Donald Trump. The 6-3 decision determined that Trump had exceeded his authority by utilizing the International Emergency Economic Powers Act (IEEPA) to enact the tariffs, a power reserved for Congress [1]. The ruling has created uncertainty surrounding existing trade agreements and prompted a swift response from the Trump administration in the form of modern tariffs under a different legal framework.
The IEEPA Ruling and Its Implications
The court’s decision centered on the argument that IEEPA, enacted in 1977, does not grant the president the authority to impose broad tariffs. The law authorizes the president to regulate commerce during national emergencies stemming from foreign threats, but the Supreme Court found this power does not extend to levying taxes, a constitutional responsibility of Congress [2]. The ruling does not address potential refunds to importers who have already paid the tariffs, estimated at over $200 billion in 2025 [1].
A Quick Shift: Section 122 Tariffs
Just days after the Supreme Court’s decision, President Trump announced a 10% across-the-board tariff on all imports under Section 122 of the Trade Act of 1974, with a potential increase to 15% [3]. This move aims to circumvent the limitations imposed by the court’s ruling on IEEPA and maintain trade protectionist measures.
Impact on Key Trading Partners: Japan and South Korea
The initial tariffs imposed under IEEPA led several countries to negotiate bilateral agreements with the United States to secure more favorable terms. Japan, for example, reached a deal in July 2025 capping reciprocal tariffs on automobiles and auto parts at 15%, down from a threatened 25% [3]. South Korea secured a similar 15% baseline alongside a $350 billion investment commitment in the U.S.
Experts suggest that while the IEEPA tariffs have been struck down, Japan’s existing agreements related to Section 232 tariffs on automobiles, semiconductors, and pharmaceuticals remain in effect [3]. However, the new 10% baseline tariff under Section 122 could potentially narrow Japan’s competitive edge.
Investment Commitments and Strategic Industries
As part of the agreements reached with the U.S., Japan pledged $550 billion in investments, loans, and loan guarantees to support projects in strategic sectors such as shipbuilding, semiconductors, and artificial intelligence [3]. Approximately $36 billion in projects were unveiled in mid-February, demonstrating a continued commitment to these investments despite the tariff uncertainty.
Geopolitical Implications and the China Factor
The Trump administration’s initial tariff campaign was widely viewed as a strategy to pressure China, Washington’s primary strategic competitor. While the new tariffs may weaken U.S. Leverage over Beijing ahead of Trump’s planned April visit to China, some analysts believe it could create an opportunity for Japan to strengthen its relationship with the U.S. [3]. As some European nations move closer to Beijing, the U.S. May seek to reinforce ties with reliable partners like Japan.
Looking Ahead
Japanese Prime Minister Sanae Takaichi is scheduled to visit Washington in March for a state visit. The focus of the visit will be to ensure the implementation of previously agreed-upon measures and to navigate the evolving trade landscape in light of the Supreme Court’s ruling and the new tariffs [3]. The situation remains fluid, and continued cooperation between the U.S. And Japan will be crucial for maintaining economic stability and addressing shared strategic interests.