The United States has launched a new investigation into several major trading partners, including China, European Union and India, following a court ruling that struck down part of former tariff policies introduced by Donald Trump. The probe, announced by US Trade Representative Jamieson Greer, will examine alleged unfair trade practices and could lead to new import taxes on goods from the targeted countries. Officials said the investigation could be completed by summer.

The inquiry is being carried out under Section 301 of US trade law and covers a wide range of economies including Japan, South Korea, Mexico, Vietnam and Bangladesh. The administration argues the move is necessary to protect American manufacturing from what it calls excess production and unfair competition from overseas markets. Notably, Canada, the second-largest US trading partner, was not included in the probe.

The investigation follows a ruling by the Supreme Court of the United States that found earlier global tariffs introduced in 2025 unlawful. After the decision, Trump imposed a temporary 10% tariff on imports worldwide and signalled it could rise to 15%. The probe also comes ahead of expected talks between US officials and representatives from China in Paris, which may pave the way for a meeting between Trump and Chinese President Xi Jinping later this month.

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