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Trade Court Rules Against Trump Tariffs: Market Reactions and Future Trade Policy Explained

Emilia Wright | May 29, 2025

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Trade Court Strikes Down Trump Tariffs: Implications for Markets and Future Prospects

In a landmark ruling late Wednesday, a U.S. trade court has voided a large portion of former President Donald Trump’s tariffs, kicking off an immediate appeal from the administration and triggering a rally in U.S. stock-index futures. This decision not only captivates market sentiments but also opens doors to questions regarding future trade policy.

What Happened

The Court of International Trade, located in Manhattan, sided with a coalition of small businesses and Democrat-led states that argued Trump had exceeded his executive authority. At the heart of this legal battle is Trump’s use of the International Emergency Economic Powers Act of 1977 (IEEPA), which does not explicitly mention tariffs, as justification for implementing these levies.

The United States Constitution grants Congress the authority to impose tariffs, though Congress has historically delegated certain tariff-setting powers to the President for specific scenarios, such as violations of trade treaties. The vital question before the court was whether the IEEPA conferred unrestricted power upon Trump to impose tariffs on goods from nearly all nations. The three-judge panel decisively stated, “The court does not read IEEPA to confer such unbounded authority and sets aside the challenged tariffs imposed thereunder.”

This ruling primarily affects Trump’s flat 10% tariffs on various trading partners, including reciprocal tariffs and those linked to fentanyl enforcement against nations like Canada, Mexico, and China. However, tariffs on steel and aluminum, implemented under a different authority, remain untouched by this ruling.

Market Reaction

The reaction from financial markets was immediate, as U.S. stocks have been particularly sensitive to a landscape dominated by tariffs. Trump’s past decisions to delay or modify tariffs often resulted in market rebounds, and this latest court decision similarly sparked sharp gains for equity futures. As of late Wednesday, S&P 500 futures (ES00) surged by 1.7%, while futures on the Dow Jones Industrial Average (YM00) jumped over 550 points, or 1.3%. Nasdaq-100 futures (NQ00) similarly climbed by 2%.

If these gains persist, major indexes could build upon the substantial progress made in May, which has more than remedied the steep sell-off that almost pushed the S&P 500 into bear market territory following Trump’s significant “reciprocal” tariffs announced on April 2. Market analysts interpret this ruling as the market “exhaling after weeks of white-knuckle volatility” resulting from tariff-induced uncertainty.

Concerns surrounding inflation and economic slowdowns, fueled by the trade war rhetoric, prompted a series of shifts in market sentiment. Trump’s subsequent moves to delay the majority of tariffs helped foster a market recovery. Just days before the ruling, Trump threatened a resounding 50% tariff on imports from the European Union effective June 1, which caused a dip in stock prices. However, when he postponed this tariff to July 9, after signaling progress in trade discussions with the EU, stocks rebounded sharply.

What’s Next?

The implications of this ruling extend beyond immediate market reactions; it also complicates ongoing trade negotiations between the U.S. and its numerous trading partners. Analysts are keen to assess how countries like China, Japan, the EU, India, and the U.K. will respond. “We believe one reason bilateral negotiations had stalled was that U.S. trading partners may have anticipated this outcome,” noted Aniket Shah, a strategist at Jefferies.

Furthermore, there remains uncertainty regarding whether the administration will seek alternative legal avenues to impose tariffs. Could the administration leverage Section 232, 301, or 201 for tariff imposition? The potential appeal to the Supreme Court further clouds the immediate horizon for investors.

Analysts from Renaissance Macro Research warn that the appeal process will extend the prevailing uncertainty that currently weighs on business investments. They pointed out that while the market has often capitalized on tariff-induced dips—with the mantra that “Trump always chickens out”—it’s essential to remember that he tends to follow through on at least some of his tariff threats. Should the administration prevail on appeal, tariffs could return, reigniting fears of trade war fallout and further market volatility.

Conclusion

The recent ruling by the Court of International Trade marks a pivotal moment in the ongoing saga of U.S. tariffs under the Trump administration, shaking the foundations of how tariffs might be implemented moving forward. While stock markets may have cheered this decision, the implications for trade relations and investor sentiment remain fraught with tension and uncertainty. Market participants now brace themselves for the intricate developments that this ruling will set into motion.