Clash Over U.S. Tariff Policy Intensifies After Supreme Court Ruling, Revenue Outlook Shaken and State Opposition Spreads

Potential Loss of $1.7 Trillion in Tariff Revenue
Refund Burden Emerges as Lawsuits Challenge Replacement Tariffs
Debt and War Spending Debates Expand Around Trade Policy

The U.S. Supreme Court’s decision to block the tariff policy of the Donald Trump administration has intensified debate surrounding the broader policy framework. Analysts argue that the ruling makes changes to the federal government’s expected revenue structure—built around tariffs—effectively unavoidable. The Trump administration has attempted to impose emergency tariffs under a new legal provision, but the legal conflict surrounding trade policy has instead deepened, with multiple state governments launching collective lawsuits against the new tariff measures. Observers increasingly conclude that the broader strategy of securing fiscal revenue through tariffs has now been placed under direct scrutiny.

Collapse of the Tariff Policy’s Legal Foundation

According to the Committee for a Responsible Federal Budget (CRFB), a U.S. fiscal watchdog organization, the Supreme Court’s decision invalidating the Trump administration’s tariff policy could result in the federal government losing as much as $1.7 trillion in revenue in the coming years. Based on this scenario, CRFB projected that U.S. national debt could reach $58 trillion by 2036. This represents an increase of roughly $2 trillion compared with the previous projection of $56 trillion, which had assumed that tariffs imposed under the International Emergency Economic Powers Act (IEEPA) would remain in place.

On the 20th of last month, the U.S. Supreme Court ruled that both the reciprocal tariffs and fentanyl-related tariffs imposed under the government’s use of IEEPA were unlawful and invalid. Following the ruling, the Trump administration declared emergency tariffs under Section 122 of the Trade Act of 1974, presenting the move as a measure to offset the anticipated decline in tariff revenue. The provision allows the president to impose additional tariffs on a wide range of imported goods for up to 150 days. Based on this authority, the administration has implemented a 10 percent emergency tariff. CRFB estimates that maintaining the 10 percent tariff rate would generate roughly $35 billion in revenue over the 150-day period. That figure slightly exceeds half of the $65 billion in revenue that would have been expected over the same period had the IEEPA tariffs remained in effect.

CRFB concluded that emergency tariffs or alternative tariff frameworks are unlikely to fully replace the revenue previously generated by the invalidated tariff system. Even if tariffs under Section 122 were made permanent or a similar tariff structure were introduced under a different legal provision, the resulting revenue would still fall short of filling the gap. The report noted that raising the emergency tariff rate from 10 percent to 15 percent could generate approximately $1.3 trillion in revenue, but a fiscal shortfall of between $400 billion and $800 billion would still remain.

The question of tariff refunds has also emerged as a key factor that could determine the ultimate fiscal impact. Earlier this month, the U.S. Court of International Trade (CIT) ruled that “all importers on record are eligible to benefit from the Supreme Court’s decision invalidating the IEEPA tariffs,” and ordered the Trump administration to begin refund procedures. Despite the ruling, U.S. Customs and Border Protection (CBP) has continued to reject tariff refund requests submitted by companies. Kevin Hassett, director of the White House National Economic Council (NEC), dismissed the issue, stating that “tariff refunds are a matter for private parties to resolve,” and adding that observers should “watch how large corporations pursue litigation to address the matter,” a response widely interpreted as an attempt to distance the administration from responsibility.

Collective Action by 24 “Blue States”

Within the United States, legal conflict surrounding the newly enacted tariff policy has continued to expand. A coalition of Democratic-leaning state governments—often referred to as “blue states”—has filed collective lawsuits challenging the Trump administration’s tariff measures, placing the policy under yet another legal test. On the 5th, 24 states including New York, Oregon, Arizona, and California filed a lawsuit with the CIT, arguing that the global tariffs newly introduced by the administration are unlawful. They contend that imposing tariffs under Section 122 of the Trade Act exceeds the constitutional authority granted to the president.

New York Attorney General Letitia James, who is leading the lawsuit, said, “President Trump is ignoring the Constitution and the law in order to impose tariffs on consumers and small businesses,” adding that “after the Supreme Court rejected his attempt to impose sweeping tariffs, the president created even greater economic disruption that increases costs for Americans.” In the complaint, the states also emphasized that “the constitutional authority to impose tariffs rests with Congress, not the president,” and that Trump has no authority to circumvent the Supreme Court’s decision. They further argued that Section 122 of the Trade Act is intended only for limited balance-of-payments crises and should not be used as a tool to address trade imbalances.

The lawsuit is also closely tied to refund demands from companies located in the participating states. With more than 2,000 tariff refund lawsuits already filed with the CIT, analysts say the participation of state governments in the legal challenge is aimed at strengthening the legal basis for companies within those states to demand refunds from the federal government. According to CBP data, approximately $134 billion in tariffs had been collected under the IEEPA measures as of the end of last year. The Penn Wharton Budget Model (PWBM) estimates that when tariffs collected since the end of last year are included, the total amount potentially subject to refunds could rise to as much as $175 billion.

Mounting Criticism of “Tariffs as a Cure-All”

Debate over the effectiveness of tariff policy has also intensified. Since his presidential campaign, Trump has repeatedly argued that tariffs could serve as a policy tool capable of replacing income taxes and reducing the federal fiscal deficit. Many economists, however, contend that this assumption does not align with the realities of the U.S. fiscal structure. Kyle Pomerleau, an international tax policy expert at the American Enterprise Institute (AEI), argued that “unilateral tariffs like those currently proposed are extremely weak as a revenue tool,” adding that while they may generate some tax revenue, “their ability to meaningfully change the direction of the national budget is extremely limited.”

This criticism becomes even more pronounced when compared with the scale of U.S. national debt. As of the end of last year, U.S. national debt had approached $39 trillion, while the federal fiscal deficit continues to expand. Although President Trump has claimed that tariffs reduced the fiscal deficit by more than 25 percent, the prevailing view is that the actual fiscal impact falls well short of that assertion. Pomerleau noted that even if tariffs imposed under IEEPA had remained in place, they would have reduced the primary deficit by only about 0.5 percentage points of gross domestic product. “No matter what the Trump administration does with tariffs,” he said, “the budget outlook does not look very favorable.”

The debate surrounding tariff policy has broadened further as it becomes intertwined with the issue of U.S. military spending. U.S. business magazine Fortune recently reported that the economic cost of potential U.S. military operations against Iran could reach as much as $210 billion. The report explained that approximately $65 billion would be required for direct military operations as well as equipment and ammunition replenishment. When combined with macroeconomic losses—such as trade disruptions, energy market instability, and financial risk—estimated at about $115 billion, the overall economic burden becomes significantly larger.

If the war were to extend for a prolonged period, the fiscal burden could escalate dramatically. Citing previous war-game analyses, Fortune reported that “U.S. inventories of critical military supplies could be depleted within a single week,” suggesting that additional costs for weapons production and logistical support could soon follow. The Penn Wharton Budget Model likewise projected that if the Iran crisis were to extend beyond two months, the economic cost borne by the United States would exceed all current estimates. The findings add weight to criticism that the Trump administration’s strategy of relying on tariffs to finance government spending does not align with the actual scale of fiscal expenditures.