Trump Administration Launches New Trade Probe After Supreme Court Tariff Ruling

Wednesday, March 11, 2026 at 7:37 PM

The Trump administration has initiated fresh trade investigations targeting manufacturing practices in foreign nations following the Supreme Court's February decision that overturned previous tariffs. The new probe under Section 301 of the Trade Act could lead to replacement import taxes affecting 16 countries including China and the European Union.

WASHINGTON — Following the Supreme Court’s February decision that invalidated President Donald Trump’s earlier tariff system, the Trump administration launched a comprehensive trade investigation Wednesday targeting foreign manufacturing practices.

The administration is working to recover hundreds of billions in lost revenue after the high court overturned Trump’s previous import taxes that were imposed during a declared economic emergency. Officials are now pursuing alternative legal pathways to establish new tariffs.

The current investigation operates under Section 301 of the Trade Act of 1974, which provides authority for implementing new import duties. However, U.S. Trade Representative Jamieson Greer cautioned reporters during a Wednesday briefing that he wouldn’t speculate about potential outcomes.

“The policy remains the same — the tools may change depending on, you know, the vagaries of courts and other things,” Greer explained, emphasizing the administration’s commitment to safeguarding American employment.

This renewed tariff effort threatens to revive the economic turbulence that disrupted global markets previously. The overturned tariffs had established new trade arrangements with international partners, and it remains uncertain how fresh import taxes might affect existing agreements. Greer characterized these trade frameworks as independent entities, separate from the current investigation.

The investigation unfolds amid ongoing conflict in Iran and approaching midterm elections where Democratic candidates are challenging Trump’s Republican supporters by arguing citizens deserve tariff refunds after the Supreme Court ruling.

According to Greer, the probe will focus on excessive industrial capacity and government support that may provide foreign manufacturers with unfair competitive advantages over American businesses.

The investigation encompasses 16 nations and territories: China, the European Union, Singapore, Switzerland, Norway, Indonesia, Malaysia, Cambodia, Thailand, South Korea, Vietnam, Taiwan, Bangladesh, Mexico, Japan, and India. Officials are examining what they consider persistent trade surpluses with America and policies including subsidies and wage suppression.

Additionally, the administration is launching another Section 301 investigation aimed at prohibiting imports of products manufactured through forced labor.

Greer suggested future Section 301 investigations might address digital service taxes, pharmaceutical pricing, and ocean pollution. The Commerce Department maintains separate trade probes under Section 232 of the 1962 Trade Expansion Act.

Time constraints pressure the administration to complete these investigations quickly. Current 10% tariffs on foreign goods under section 122 of the 1974 Trade Act will expire July 24 after 150 days. While Trump announced plans to increase that rate to 15%, he hasn’t implemented the change.

Greer indicated the administration is “keying off” the investigation timeline based on the 150-day deadline, aiming to present “potential options” to Trump promptly.

The investigations will operate independently from last year’s trade frameworks that established baseline tariff rates, including 15% charges on European Union, Japanese, and South Korean goods before the Supreme Court’s reversal. However, Greer suggested these frameworks might influence decisions.

“My sense is that these countries continue to want to deal, and President Trump continues to want the deal,” Greer stated, noting that with tariffs under consideration, countries’ commitments and framework implementation would be evaluated as they intersect with Section 301 requirements.

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