Can the president impose tariffs without congressional approval? Only within the boundaries Congress has already drawn. The Constitution gives Congress alone the power to tax imports and regulate foreign commerce, so every tariff a president imposes has to trace back to a statute that spells out when and how the executive branch may act. Several such statutes exist, each with its own trigger and its own limits, and in February 2026 the Supreme Court closed off one of them for tariff use entirely.
Where the Constitution Places Tariff Power
Article I, Section 8 gives Congress the power “to lay and collect Taxes, Duties, Imposts and Excises” and “to regulate Commerce with foreign Nations.”1Congress.gov. Article I Section 8 Setting tariff rates is a legislative function. The president holds no independent constitutional authority to create trade barriers or raise the cost of imports.
Congress has never tried to vote on every rate change for every product from every country. Beginning with the Reciprocal Trade Agreements Act of 1934, it started handing the president limited authority to negotiate deals and adjust rates within defined boundaries.2Office of the Historian. New Deal Trade Policy: The Export-Import Bank and the Reciprocal Trade Agreements Act, 1934 Later trade laws built on that pattern. The result is a patchwork of statutes, each granting a different tool for a different purpose. When a president imposes tariffs, the first question is always which statute the action rests on.
Section 232 and National Security
Section 232 of the Trade Expansion Act of 1962 lets the president restrict imports that threaten national security. The Secretary of Commerce runs the investigation, deciding whether a particular type of import is undermining industries that matter for defense or critical infrastructure. That investigation has 270 days to conclude and produce a report.3Office of the Law Revision Counsel. 19 US Code 1862 – Safeguarding National Security
If the Secretary finds a threat, the president has 90 days to agree and choose a response, and 15 days after that to begin implementation. A written explanation goes to Congress within 30 days of the determination. Responses can include tariffs, quotas, or negotiated agreements with exporting countries.
“National security” here is read broadly. It covers not just weapons and military equipment but the overall health of domestic industries and access to raw materials. Steel and aluminum have been the most prominent targets. Tariffs on those metals were originally 25 percent for steel and 10 percent for aluminum in 2018, later raised to 25 percent across the board, and increased again in mid-2025 to 50 percent for most countries. The Bureau of Industry and Security also ended the company-level exclusion process that had allowed exemptions from Section 232 duties, replacing it with an “inclusions process” through which the public can request additional products be covered.4Bureau of Industry and Security. Section 232 Steel and Aluminum
Section 301 and Unfair Foreign Practices
Section 301 of the Trade Act of 1974 addresses foreign governments that violate trade agreements or engage in practices that unfairly burden U.S. commerce. The U.S. Trade Representative runs these investigations, taking evidence from affected businesses and holding public hearings.5Office of the Law Revision Counsel. 19 USC 2411 – Actions by United States Trade Representative
If the USTR finds a foreign country’s practices are unjustifiable and restrict U.S. commerce, it recommends retaliatory action. The president has final say over whether to accept those recommendations. The statute ties the value of the response to the burden the foreign practice imposes on American commerce. In practice, Section 301 rates on Chinese goods have ranged from 25 percent to 100 percent depending on the product, with electric vehicles, semiconductors, solar cells, and steel at the high end.
Section 301 tariffs work as leverage. The point is to pressure the foreign government into changing its behavior, so rates can be modified or removed if the underlying dispute is resolved. The USTR reviews existing actions on a rolling basis and can extend, modify, or grant product-specific exclusions.
Section 201 and Import Surges
Section 201 of the Trade Act of 1974 covers a different situation: imports surging so heavily that they cause serious injury to a competing domestic industry. Unlike Section 301, this tool has nothing to do with unfair foreign practices. The imports can be perfectly legal and fairly traded; the issue is volume.
The U.S. International Trade Commission investigates whether increased imports are a “substantial cause” of serious injury or threat of serious injury to a domestic industry.6Office of the Law Revision Counsel. 19 USC 2251 – Action to Facilitate Positive Adjustment to Import Competition The ITC generally must reach its injury finding within 120 days and send a full report with relief recommendations to the president within 180 days.7United States International Trade Commission. Understanding Section 201 Safeguard Investigations
If injury is found, the president chooses the relief. The statute frames the goal as “positive adjustment,” meaning the domestic industry uses the breathing room to become more competitive or shift resources elsewhere. Relief is not meant to be permanent, and the ITC monitors the industry and reports back to the president and Congress on whether the measures are working. Solar panels and washing machines have been recent targets.
IEEPA and the Supreme Court’s 2026 Limit
The International Emergency Economic Powers Act gives the president sweeping authority to regulate international financial transactions and the movement of property during a declared national emergency. The president must identify an “unusual and extraordinary threat” originating substantially outside the United States and formally declare an emergency.8Office of the Law Revision Counsel. 50 USC 1701 – Unusual and Extraordinary Threat; Declaration of National Emergency; Exercise of Presidential Authorities Once the declaration is in place, the president gains broad power to block transactions, freeze assets, and regulate imports and exports.9Office of the Law Revision Counsel. 50 USC 1702 – Presidential Authorities
In early 2025, IEEPA was invoked to impose what the administration called “reciprocal tariffs” on imports from dozens of countries, with rates ranging from a 10 percent baseline to as high as 50 percent for certain trading partners. No president had previously used IEEPA to impose tariffs. The legal theory was that the power to “regulate importation” of property included the power to tax it at the border.
That theory did not survive review. The Court of International Trade granted summary judgment against the tariffs, and the Federal Circuit affirmed, finding that IEEPA’s authority to regulate importation did not extend to tariffs “unbounded in scope, amount, and duration.” The Supreme Court took the consolidated cases and in February 2026 held that “IEEPA does not authorize the President to impose tariffs.”10Supreme Court of the United States. Learning Resources, Inc. v. Trump, No. 24-1287 The ruling also confirmed that the Court of International Trade has exclusive jurisdiction over challenges to tariff modifications, and it vacated a parallel district court case for lack of jurisdiction.
The IEEPA ruling did not touch the statute’s other uses. Presidents still invoke IEEPA regularly for economic sanctions on countries and individuals. The law requires consultation with Congress before the president exercises these powers and mandates immediate and periodic reports on the emergency, the actions taken, and the countries involved.11Office of the Law Revision Counsel. 50 USC 1703 – Consultation and Reports
How Presidential Tariffs Get Challenged
The United States Court of International Trade hears civil actions arising from import transactions and laws affecting international trade. Under the Customs Courts Act of 1980, it holds exclusive jurisdiction over challenges to executive branch tariff actions.12United States Court of International Trade. About the Court The Supreme Court reinforced that in the IEEPA cases, holding that a district court lacked jurisdiction over what was fundamentally a challenge to modifications of the tariff schedule.10Supreme Court of the United States. Learning Resources, Inc. v. Trump, No. 24-1287
Winning a tariff challenge is hard when the underlying statute grants the president broad discretion. Courts have historically been reluctant to second-guess presidential findings on national security under Section 232 or unfair trade practices under Section 301. The IEEPA cases succeeded on a different theory. The question was not whether the president exercised discretion wisely but whether the statute authorized tariffs at all. That statutory framing is where challengers have the strongest footing.
Is Congress Taking the Authority Back?
Congress delegated tariff authority over many decades and can take it back. Lawmakers can repeal or amend the underlying statutes, add sunset clauses, or require congressional approval before tariffs take effect. Several bills in the 119th Congress try to do exactly that.13Congress.gov. Congressional and Presidential Authority to Impose Import Tariffs
The most common approach is requiring a joint resolution of approval. Under proposals like the Trade Review Act of 2025, tariffs imposed by the president would expire after 60 days unless both chambers voted to keep them. Other bills target specific relationships: the STABLE Trade Policy Act would require congressional approval before imposing tariffs on NATO allies, free trade agreement partners, and designated non-NATO allies. A separate proposal would narrow the types of goods Section 232 can cover and require a congressional vote before the president acts.
Under current law, the main congressional check on IEEPA-based emergency declarations is a joint resolution of disapproval, which requires passage by both chambers and is subject to presidential veto. That makes ending an emergency declaration nearly impossible without a veto-proof supermajority. The Supreme Court’s 2026 ruling mooted the IEEPA tariff question specifically, but the larger debate about how much unilateral trade authority any president should hold is what continues to drive the legislation.