A constitutional showdown is brewing as Costco challenges President Trump’s tariff authority, exposing a fundamental question: Does the president have the power to impose massive trade duties without Congressional approval?
At a Glance
- Costco filed suit on November 28, 2025, seeking refunds for tariffs already paid and blocking future collection pending a Supreme Court ruling
- Federal courts have already ruled that Trump lacks the authority to impose tariffs under the International Emergency Economic Powers Act
- A December 15 liquidation deadline threatens to permanently block tariff refunds even if courts rule against the administration
- The Supreme Court appeared skeptical of the administration’s tariff authority during the November 5 oral arguments
- Dozens of companies have filed similar lawsuits to protect their right to potential refunds
Constitutional Authority Under Fire
The U.S. Court of Appeals for the Federal Circuit ruled in August that President Trump does not possess the legal authority to impose tariffs under the International Emergency Economic Powers Act. In a 7-4 decision, the court affirmed that tariff authority belongs exclusively to Congress.
The Federal Circuit stated clearly: “The core Congressional power to impose taxes such as tariffs is vested exclusively in the legislative branch by the Constitution. Tariffs are a core Congressional power.”
This ruling directly challenges the administration’s unilateral imposition of reciprocal and fentanyl duties affecting Canada, China, Mexico, and numerous trading partners.
Here's what is really happening.
Costco wants to preserve its eligibility for tariff refunds IF the SCOTUS eventually rules the tariffs are illegal.The only way to preserve that right is to file suit for a refund prior to Dec. 15th.https://t.co/Bb8zv9QTUE
— Brick Suit (@Brick_Suit) December 2, 2025
Costco’s Legal Gambit
Costco filed its lawsuit in the U.S. Court of International Trade on November 28, 2025, recognizing a critical vulnerability in the tariff dispute. The company faces a December 15 liquidation deadline—the final computation of tariffs assessed on imported items—after which refunds become nearly impossible to obtain.
Costco argues that even if the Supreme Court rules the tariffs unlawful, the company risks losing millions already paid because liquidated entries are difficult to protest. This deadline creates urgency that the Supreme Court’s slower appellate process cannot match, forcing companies to act independently through litigation.
Supreme Court Signals Doubt
During oral arguments on November 5, a majority of the Supreme Court’s nine justices appeared skeptical of the administration’s legal position. The justices questioned whether the president possessed constitutional authority to impose these duties without Congressional action unilaterally.
The Court accepted the case on an expedited basis, but the timeline remains unclear. This judicial skepticism aligns with the Federal Circuit’s reasoning and suggests the administration faces significant obstacles in defending its tariff authority before the nation’s highest court.
Widespread Corporate Resistance
Costco is not alone in this fight. Dozens of companies have filed similar lawsuits to protect their rights to potential refunds if the Supreme Court rules against the tariffs.
These businesses recognize the practical trap: paying tariffs now while hoping for refunds later, only to face administrative deadlines that could permanently eliminate their recovery options.
The White House claims the tariff authority is lawful and warns of “enormous economic consequences” from refunds, but corporate America increasingly views these duties as unconstitutional overreach requiring judicial correction.
Executive Power vs. Constitutional Limits
This dispute represents a fundamental constitutional question about executive power limits. The administration invoked emergency authority to bypass Congress, but courts have consistently held that tax and tariff authority cannot be delegated to the president.
Conservatives traditionally champion constitutional limits on government power, yet this case pits tariff policy—often supported by Trump’s base—against constitutional separation of powers.
The tension highlights that constitutional principles sometimes conflict with preferred policies, requiring courts to enforce constitutional boundaries regardless of political preferences.
The December 15 Deadline Crisis
The looming December 15 liquidation deadline creates an artificial urgency that bypasses normal legal processes. Costco argues this deadline could permanently prevent refunds even if courts declare the tariffs unlawful.
The company notes that while importers have six months to protest liquidation, “not all liquidations are protestable,” creating a legal trap.
This procedural obstacle forces companies to litigate independently rather than wait for the Supreme Court’s decision, complicating the path to judicial resolution and potentially leaving businesses uncompensated for unlawfully collected duties.
White House Defiance
White House spokesman Kush Desai responded to Costco’s lawsuit by asserting the tariffs are “lawful” and warning of economic consequences from refunds. The administration expressed confidence in the Supreme Court’s “speedy and proper resolution,” but this optimism contradicts the judicial skepticism already evident.
The administration’s position—that courts should uphold executive tariff authority—directly challenges decades of constitutional precedent limiting executive tax powers. This confrontation between executive assertion and constitutional limits will ultimately determine whether presidents can unilaterally impose primary trade duties.
