President Donald Trump’s sweeping approach to tariffs is under intense judicial scrutiny as a landmark court case unfolds that could decide the fate of hundreds of billions of dollars of U.S. trade policy. On Thursday, a rare eleven-judge panel at the U.S. Court of International Trade in New York will hear oral arguments over the legality of tariffs imposed under Trump’s administration, a decision with far-reaching consequences for global commerce and the balance of power between the White House and Congress.

Legal Showdown Over Presidential Powers

The case centers on the Trump administration’s use of the International Emergency Economic Powers Act (IEEPA) of 1977 to levy tariffs broadly against numerous U.S. trading partners. V.O.S. Selections Inc., a New York-based wine and spirits importer, and Plastic Services and Products, a manufacturer specializing in pipes and fittings, have filed suit, arguing that the President overstepped his statutory authority. Their core contention: IEEPA was never intended to provide any President carte blanche to implement tariffs without specific Congressional approval, especially on this expansive scale.

The companies assert in their filings, “IEEPA nowhere mentions tariffs, duties, imposts, or taxes, and no other President in the statute’s nearly 50-year history has claimed it authorizes tariffs.” They argue the current application bypasses centuries-old constitutional checks on trade, which has been the exclusive remit of Congress.

Ruling Could Reshape Global Trade Relationships

Trump’s tariffs, some of which are scheduled to increase beginning Friday, impact imports from more than a dozen countries including China, Canada, Mexico, the European Union, Japan, India, and Brazil. Many of the announced rates mirror those from earlier in the year, though some hikes have been delayed or adjusted as markets fluctuated.

These actions have introduced substantial volatility for U.S. businesses. As the National Retail Federation stated in June 2025, “Unpredictable and rapidly changing tariff policies are making it nearly impossible to forecast costs, place orders and manage supply chains effectively.” U.S. retailers, manufacturers, and agricultural exporters have all reported difficulty adjusting to the ongoing uncertainty.

Arguments on Both Sides

The Trump administration defends its policies by citing persistent trade deficits and threats to critical industries as constituting a “national emergency,” warranting the use of IEEPA. In a May 2025 statement, the White House said, “trade deficits have created a national emergency that has decimated American communities, left our workers behind, and weakened our defense industrial base.” This argument, however, was previously rejected by the Court of International Trade, which found that neither the tariffs nor the use of IEEPA met the threshold of an “unusual and extraordinary” risk as required by law. The judges initially blocked the tariffs in late May, ruling that the President’s executive orders lacked any discernible limits and risked undermining the constitutional separation of powers.

Economic Impact: Uncertainty and Higher Costs

While the current legal challenge focuses on tariffs imposed via IEEPA, a series of other tariffs enacted under different authorities remain in place—such as a 10% duty on steel imports from the United Kingdom, and a 50% duty on steel and aluminum from other countries, all imposed under the Trade Act of 1974 and the Trade Expansion Act of 1962.

Outside of the courtroom, pushback continues on multiple fronts. Dozens of lawsuits by domestic companies allege that the tariffs will drive up prices for U.S. consumers and businesses. For example, earlier this month an importer of orange juice warned that new tariffs on Brazilian imports—set at 50% despite a U.S. trade surplus—could lead to a 25% price spike domestically.

The impact reverberates beyond direct trade costs. Global supply chains become more fragile as uncertainty discourages investment and disrupts established relationships. A June 2025 UBS estimate revealed that the United States has over 12,000 possible tariff categories affecting more than 200 trading partners. Industry groups warn that the unpredictable environment is impeding long-term investment in infrastructure, technology, and workforce development.

Possible Paths Forward for the Administration

If the courts ultimately strike down the IEEPA-based tariffs, President Trump has several legal pathways to reassert trade barriers. He could instruct federal agencies to open new investigations under Section 301 of the 1974 Trade Act—often used in recent years to confront unfair foreign practices—or Section 232 of the 1962 Act, which allows tariffs on national security grounds. Both avenues could take months to years, offering only temporary clarity.

Additionally, as noted by political economist Alec Phillips of Goldman Sachs, Trump could invoke the rarely used Section 338 of the Trade Act of 1930, enabling tariffs of up to 50% on imports from countries accused of discriminating against the United States. This authority, yet to be tested in modern trade disputes, bypasses the need for formal investigations but caps the tariff maximums.

There is also the option of seeking new legislation or negotiating formal trade agreements with Congress’s approval—though this process is typically protracted given the vast complexity of the U.S. trade matrix.

Broader Implications: Executive Power vs. Congressional Oversight

The outcome of this legal battle will help clarify the boundaries of executive authority in the economic sphere. While many in Trump’s cabinet, including Treasury Secretary Scott Bessent and Commerce Secretary Howard Lutnick, support robust executive action to defend American jobs, critics warn that unchecked power can undermine both international relationships and the rule of law.

Nearly every modern U.S. president has used tariff threats or duties as leverage in trade negotiations, but few have done so as aggressively or unilaterally as Trump. The court’s forthcoming decision—likely to be appealed to the Supreme Court regardless of outcome—could either reinforce a tradition of bipartisan economic governance or pave the way for more unilateral White House action on trade.

“The next 100 days will test the boundaries of executive authority and the resilience of Congress’s oversight role,” wrote Max Yoeli and Leslie Vinjamuri of Chatham House and the Chicago Council on Global Affairs in a recent essay. “The president retains many other tools, including export controls and sanctions, to pursue U.S. objectives.”

A Decision Awaited Worldwide

Markets, businesses, and foreign governments are watching closely as the court weighs the future of Trump’s tariffs. For American companies and consumers, the stakes are immediate: billions in trade and the final price of countless goods from steel to orange juice are in play. For U.S. allies and rivals, the outcome could define the global trading order—and set the tone for the remainder of Trump’s term.

Ultimately, the fate of the executive’s power to shape U.S. trade—with or without Congress—hangs in the balance, as the world awaits a landmark ruling from New York’s judicial bench.