Last updated 5 months ago. Our resources are updated regularly but please keep in mind that links, programs, policies, and contact information do change.
On November 5, 2025, the Supreme Court heard what has been called the biggest legal test yet of the Trump administration’s presidency. The justices spent over two-and-a-half hours hearing arguments in Learning Resources, Inc. v. Trump, a case that crystalizes a constitutional conflict over money, national emergencies, and the separation of powers.
The central question: Did Congress, when it passed a 1977 emergency-powers law, give the president authority to unilaterally impose trillions of dollars in global taxes, that is, tariffs, by declaring a national emergency?
These new emergency tariffs are only the latest tool the administration has used.
The President’s Tariff Toolkit
Presidential trade policy isn’t one single thing. The administration has used different laws to impose tariffs, each with its own rationale, process, and limits. Understanding these tools is key to understanding the legal battles.
Section 232: The National Security Tool
What it is: Section 232 of the Trade Expansion Act of 1962.
The rationale: This law lets the president impose tariffs on any imports that threaten to impair national security.
The process: This power isn’t unilateral. It requires a formal investigation by the U.S. Department of Commerce‘s Bureau of Industry and Security. The Commerce Secretary has 270 days to conduct the investigation and present a report to the president.
How it’s been used: This was the law used during the first Trump term to apply 25% tariffs on imported steel and 10% tariffs on aluminum. In 2025, the administration reinstated these tariffs in full, revoking all exemptions granted to allies like the European Union, Canada, Mexico, Japan, and the United Kingdom. The administration has also launched new Section 232 investigations into copper, lumber, furniture, and autos.
Section 301: The Unfair Trade Tool
What it is: Section 301 of the Trade Act of 1974.
The rationale: This law is the primary tool for combating unfair trade practices. It gives the U.S. Trade Representative broad authority to investigate and take action against any foreign country’s policy that is unjustifiable or discriminatory and burdens U.S. commerce.
The process: The USTR must initiate an investigation, hold public hearings, and consult with private sector advisors before imposing retaliatory tariffs.
How it’s been used: This was the primary legal weapon for the trade war with China. The Section 301 tariffs imposed during the first Trump term were justified by a USTR investigation finding that China’s policies on intellectual property and forced technology transfer were discriminatory. In 2025, the administration launched a new Section 301 investigation into China’s maritime, logistics, and shipbuilding sectors, but later suspended the responsive actions for one year as part of a new trade deal.
IEEPA: The National Emergency Tool
What it is: The International Emergency Economic Powers Act of 1977.
The rationale: This law empowers the president to regulate importation to deal with any unusual and extraordinary threat to national security, foreign policy, or the economy.
The process: IEEPA does not require a lengthy investigation by Commerce or USTR. The president can act simply by declaring a national emergency.
How it’s been used: For 50 years, this law was used by presidents to impose sanctions like freezing assets or blocking transactions, not tariffs. The Trump administration was the first to ever use IEEPA to levy import taxes. In 2025, it was used to justify two massive tariff regimes:
- Trafficking Tariffs: Targeting China, Mexico, and Canada for allegedly failing to stop the flow of fentanyl.
- Reciprocal Tariffs: A 10% baseline global tariff on nearly all countries, plus higher rates on many, justified by large and persistent trade deficits.
Section 338: The Time Machine Tool
What it is: A long-dormant provision from the Tariff Act of 1930, also known as the Smoot-Hawley Tariff Act.
The rationale: It allows the president to impose tariffs of up to 50% on imports from countries that have discriminated against U.S. businesses.
How it’s been used: This law has never been used. It’s now being discussed publicly by administration officials and trade experts as a potential Plan B if the Supreme Court strikes down the IEEPA tariffs.
Tariff Toolkit Summary
| Statute | Legal Basis | Process Required | Key Limitations | Primary Use |
|---|---|---|---|---|
| Section 232 (“National Security”) | Imports threaten national security | 270-day Commerce investigation & report | Rationale is broad, but requires formal investigation | Steel, aluminum, autos, copper, lumber, furniture |
| Section 301 (“Unfair Trade”) | Foreign practices are unfair or discriminatory | USTR investigation, public hearings, consultations | Must target a specific country’s unfair policy | China (intellectual property, shipbuilding) |
| IEEPA (“National Emergency”) | Unusual and extraordinary threat to security, economy, or foreign policy | Presidential declaration of national emergency | None in the text. This is the central dispute | Global “Reciprocal Tariffs” and “Trafficking Tariffs” |
| Section 338 (“Discrimination”) | Foreign country discriminates against U.S. commerce | Presidential finding after USITC investigation | Cap of 50%; has never been used | None (Held as potential “Plan B”) |
The administration’s choice of tool reveals its strategy. Section 232 and Section 301, while powerful, are procedurally cumbersome. They require months-long investigations, reports, and public comment periods.
IEEPA’s primary advantage is its speed and scope. It allowed the president to avoid lengthy trade investigations and impose tariffs on nearly all goods from nearly every country in the world overnight. The 2025 reciprocal tariffs were so broad they likely couldn’t have been justified under Section 232’s national security logic or Section 301’s country-specific unfair trade logic. The administration needed a tool that allowed it to tax the entire world at once, and only IEEPA’s vague emergency trigger offered that power.
This distinction is now at the heart of the Supreme Court case. Challengers argue that the very existence of specific, limited tariff laws proves that Congress never intended for IEEPA to be an unlimited, universal tariff tool. As a brief from 207 members of Congress argued, the administration’s interpretation would effectively nullify the guardrails set forth in every statute where Congress expressly granted the president limited tariff authority.
How Courts Have Reacted
The Supreme Court’s reaction to the tariffs hasn’t been uniform. It’s been a differentiated pattern of action and inaction, depending on which law the president used.
Section 232: We’d Rather Not Say
When challengers first sued to block the Section 232 steel and aluminum tariffs, they argued the law was unconstitutional.
Case 1: American Institute for International Steel v. United States. The core claim was that Section 232’s national security standard was so vague it violated the non-delegation doctrine, a constitutional rule that says Congress cannot give away its legislative power to the president.
The reaction: On June 22, 2020, the Supreme Court denied certiorari. This means they refused to hear the case, leaving the tariffs in place.
Case 2: Transpacific Steel LLC v. United States. This challenge argued the president missed statutory deadlines when he doubled tariffs on steel from Turkey.
The reaction: The Supreme Court also denied certiorari on March 28, 2022.
The judiciary’s message on Section 232 was clear: it would not intervene. This is largely because courts are historically reluctant to second-guess a determination by a president on a national security matter, and they have been unwilling to revive the non-delegation doctrine.
Section 301: The Process Was Lawful
The legal fight over the China tariffs was different. It was not a constitutional challenge, but a procedural one.
The case: HMTX Industries LLC v. United States. Thousands of importers sued, arguing that the List 3 and List 4A tariffs were illegal. They claimed the USTR’s initial investigation only authorized the first $50 billion in tariffs, and the agency had no authority to modify the action to add another $300+ billion in tariffs simply because China retaliated.
The reaction: The lower courts largely sided with the government. In September 2025, the Federal Circuit upheld the tariffs, ruling that the USTR did have the statutory authority to modify its action in response to China’s retaliation.
Here, the courts reviewed the agency’s actions and found they followed the rules laid out in the law. This green-lighted the administration’s aggressive use of Section 301.
IEEPA: This We Have to See
The pattern of judicial avoidance on Section 232 and procedural approval on Section 301 set the stage for the IEEPA tariffs in 2025. But the reaction this time was completely different.
The case: Learning Resources v. Trump and V.O.S. Selections v. Trump. Challengers, including small businesses and a dozen states, sued, arguing the president has no authority under IEEPA to levy tariffs.
The reaction: The lower courts, including the U.S. Court of International Trade and the U.S. Court of Appeals for the Federal Circuit, struck down the IEEPA tariffs as illegal.
The Supreme Court’s reaction: In a sharp break from its 2020 and 2022 behavior, the Supreme Court granted certiorari on September 9, 2025. Furthermore, it expedited the case, scheduling oral arguments for November 5, 2025.
This differentiated pattern is the Supreme Court’s reaction. By dodging the national security case on Section 232 and upholding the procedural case on Section 301, the judiciary effectively allowed the administration’s tariff-by-any-means approach to continue. This may have emboldened the administration to try the IEEPA shortcut.
The IEEPA overreach, however, was so transformative that it finally crossed a constitutional line. The administration was no longer interpreting a tariff law. It was using a non-tariff, emergency law to seize the one power Congress guards most jealously: the power to tax. This forced the Court to intervene.
The November 5 Arguments
The November 5, 2025, oral arguments provided a clear view of the conflict, revealing deep skepticism from a broad, cross-ideological range of justices.
The Administration’s Argument
Solicitor General D. John Sauer argued that IEEPA’s text granting the president power to regulate importation is a sweeping delegation of authority that plainly embraces tariffs.
- These tariffs are not a tax, which is Congress’s power.
- Instead, they are a regulatory tool, which is the president’s power.
- The fact that these regulatory tariffs raise hundreds of billions of dollars is merely incidental to their purpose.
- This power is justified by the president’s broad, inherent Article II authority in foreign affairs.
The Challengers’ Argument
Former Solicitor General Neal Katyal argued the case was simple: tariffs are taxes.
- The Constitution explicitly gives Congress the power to lay and collect duties and regulate commerce.
- The word tariff or duty never appears in the IEEPA statute.
- As Katyal argued, it’s simply implausible that Congress, in 1977, handed the president the power to overhaul the entire tariff system by silently hiding it in a law that never mentions it.
Skepticism From the Bench
A majority of the justices, including key conservatives, appeared dubious of the administration’s case.
Chief Justice John Roberts immediately challenged the not-a-tax argument: “The vehicle is the imposition of taxes on Americans, and that has always been a core power of Congress.”
Justice Sonia Sotomayor was more blunt: “I just don’t understand this argument… You want to say tariffs are not taxes, but that’s exactly what they are.”
Justice Neil Gorsuch focused on the long-term threat to the separation of powers. He warned of a one-way ratchet toward the gradual but continual accretion of power in the executive branch. He then posed a critical question: If Congress can hand off its tariff power, “what would prohibit Congress from just abdicating all responsibility to regulate foreign commerce, or, for that matter, declare war, to the president?”
Justice Elena Kagan noted that other real tariff laws like Section 232 have real constraints, such as time limits or caps. IEEPA, by contrast, has none, which she suggested makes the administration’s claim of delegated power highly problematic.
The administration’s legal argument was also undermined by the president himself. Hours after his lawyer told the Supreme Court that the hundreds of billions of dollars in revenue were merely incidental, the president declared in a speech, “My tariffs are bringing in hundreds of billions of dollars.” This direct contradiction undermines the government’s core legal position.
Two Constitutional Doctrines
The justices’ skepticism is rooted in two constitutional doctrines that are central to this case.
The Major Questions Doctrine
This is a common-sense rule from the Supreme Court. It says that if a president or federal agency wants to use an old, vaguely-worded law to make a new, sweeping policy that has vast economic and political significance, they cannot. To do something that big, they must go back to Congress and get explicit, clear congressional authorization for that specific new power.
How it applies: Challengers argue the IEEPA tariff is a classic overreach. The administration is claiming to find a new power, it has never been used for tariffs, a unprecedented power, global tariffs on all countries, and a vastly significant power, a multi-trillion-dollar tax hike, in a 1977 law that doesn’t even mention the word tariff.
The government’s rebuttal: The administration argues the doctrine doesn’t apply in the context of foreign affairs, where the president is supposed to have broad, sweeping emergency powers.
The Non-Delegation Doctrine
This doctrine comes directly from the Constitution’s separation of powers. It holds that Congress, and only Congress, has all legislative powers. Therefore, Congress cannot give away or abdicate its core jobs, like the power to tax or declare war, to the president. Congress can let the executive fill up the details, but it must first provide an intelligible principle to guide the president’s discretion.
How it applies: Challengers argue that if IEEPA is read to grant tariff power, it does so without any intelligible principle. It places no limits on the tariff rates, the duration, or the products covered. This, they say, is an unconstitutional abdication of Congress’s core taxing power.
The Gorsuch connection: This doctrine is a pet project for Justice Gorsuch. In his famous 2019 dissent in Gundy v. United States, he argued that the intelligible principle test has become too weak. He proposed a new, much tougher three-part test. Justice Gorsuch’s sharp abdication questions during the tariff hearing strongly signal that he sees this case as the perfect vehicle to finally revive his stricter version of the doctrine.
Most legal analysts believe the Court will use the Major Questions Doctrine as a surgical tool to strike down the IEEPA tariffs, while avoiding the Non-Delegation Doctrine. Reviving the NDD would be destabilizing and could imperil potentially hundreds of thousands of statutes. The Court just declined to do this in June 2025 in Consumers’ Research v. FCC. The Major Questions Doctrine, by contrast, allows the Court to rein in this specific presidential overreach by ruling Congress was not clear enough here, without causing constitutional chaos.
What Happens If the Court Rejects IEEPA Tariffs
A ruling against the administration won’t mean the end of tariffs. It will trigger a cascade of legal, economic, and practical consequences.
The President’s Plan B
First, a Supreme Court ruling against IEEPA only strikes down the tariffs imposed under that specific law, the reciprocal and trafficking tariffs. It would not touch the tariffs imposed under Section 232 (steel, aluminum, copper, etc.) or Section 301 (China).
Trade lawyers and administration officials agree: the president has a Plan B and would simply pivot to these other, cumbersome but effective, legal tools.
Plan B, Tool 1: Expand Section 232. The administration would move to re-impose tariffs on goods and countries by launching a new wave of national security investigations. This is the administration’s strongest fallback, as the Supreme Court’s 2020 and 2022 cert denials sent a strong signal that the judiciary will not second-guess the president’s national security findings.
Plan B, Tool 2: Expand Section 301. The USTR would be directed to launch a series of new unfair trade investigations. This is a slower, more bureaucratic process, but one that lower courts have already upheld.
Plan B, Tool 3: The Time Machine Option. The administration could activate the long-forgotten Section 338 of the 1930 Tariff Act. This law, which has never been used, gives the president the power to impose 50% tariffs on discriminating countries.
A rejection of IEEPA would not be the end of the tariffs. It would be the end of the shortcut. It would force the administration back into the slower, bureaucratic process that these other laws require, reintroducing the procedural checks, investigations, reports, public comment, that IEEPA was used to avoid.
The Economic Earthquake
The immediate financial and diplomatic fallout would be immense.
Diplomatic uncertainty: A ruling could unravel recent trade deals. Allies who negotiated agreements under the threat of IEEPA tariffs might demand renegotiation, sowing confusion among trading partners. It would significantly shrink American negotiating power.
The trillion-dollar question: If the Supreme Court rules the tariffs were illegal, all duties collected under IEEPA must be refunded with interest to the importers who paid them.
The scale is massive. The Congressional Budget Office projected the IEEPA tariffs would raise $3.3 trillion over the 2025–2035 period. As of fall 2025, the government had already collected over $88 billion to $100 billion from these specific tariffs. Some estimates for the total refund liability run from $750 billion to $1 trillion.
These staggering numbers aren’t just an economic data point. They’re a political weapon. The administration warned that a ruling against them would cause financial ruin. The Cato Institute noted this argument could influence the court’s decision for institutional reasons, even if the law points another way.
How Importers Get Refunds
This is the most practical consequence for the thousands of U.S. businesses that paid these taxes. The refunds are not automatic. Importers must affirmatively file claims with U.S. Customs and Border Protection to get their money back. There are two main paths, depending on the status of the import.
Path 1: For unliquidated entries. An entry is the formal import documentation. Liquidation is when CBP finalizes the duty bill, which typically happens 314 days after import. If an entry is not yet liquidated, the importer can file a Post-Summary Correction to electronically remove the illegal tariff component and request a refund.
Path 2: For liquidated entries. If the duty bill is already final, the importer must file a protest. This is extremely time-sensitive. The protest must be filed within 180 days of the liquidation date. Missing this deadline by even one day is an absolute bar to recovery.
If CBP denies the protest, the importer’s final step is to sue the government for the refund in the U.S. Court of International Trade. While some consumers who paid higher prices may also have arguments for recovering costs, the direct legal path for refunds belongs to the companies that paid the duties.
Our articles make government information more accessible. Please consult a qualified professional for financial, legal, or health advice specific to your circumstances.