US President Donald Trump declared his absolute tariffs authority in a social media post on 15 March 2026. He responded to a Supreme Court ruling that invalidated his previous global tariffs. Trump quickly imposed a new 10 percent duty on imports and initiated probes into 60 economies.

This development heightens US trade disputes, especially with China. Beijing criticized the actions as unilateral. The events underscore ongoing debates over presidential powers in economic policy.

Trump Asserts Tariffs Authority Post-Ruling

Trump posted on Truth Social that he holds the absolute right to charge tariffs in another form. He claimed the Supreme Court decision could cost the US trillions. Officials launched investigations into countries like China, the EU, and Japan over forced labor and commerce burdens.

The Supreme Court ruled on 20 February 2026 that Trump exceeded his authority under the International Emergency Economic Powers Act. Justices voted 6-3 against the tariffs imposed last year. Chief Justice John G. Roberts Jr. authored the opinion, limiting presidential emergency powers.

Trump wound down the invalidated tariffs but announced a new 10 percent global levy effective soon after. He criticized the court for favoring foreign nations. This shift maintains pressure on international trade partners.

Background on Trade Policies and Criticisms

Trump's tariffs authority stems from executive actions amid economic tensions. He previously used emergency laws to impose duties on most trading partners. The court found this overreach, prompting his defiant response.

Critics argue such moves disrupt global markets. Trump also attacked Federal Judge James Boasberg for blocking subpoenas in a Federal Reserve probe. He accused the judge of political bias in handling cases involving Fed Chair Jerome Powell.

Trump attempted to remove Fed Governor Lisa Cook over mortgage fraud allegations. The Supreme Court expressed skepticism in January 2026 about sufficient cause for her dismissal. These actions highlight Trump's broader conflicts with judicial and financial institutions.

International Reactions to New Measures

China urged the US to correct its erroneous ways on 15 March 2026. Beijing's commerce ministry labeled the probes arbitrary and discriminatory. Officials met in Paris for two-day talks to address escalating disputes.

No immediate responses came from the EU or Japan by press time. Newsroom contacted their embassies on 16 March 2026 but received no reply. Analysts predict potential retaliatory tariffs, affecting global supply chains.

Trump wrote, "This completely inept and embarrassing Court was not what the Supreme Court of the United States was set up by our wonderful Founders to be," in his post. Such statements fuel discussions on separation of powers. Meanwhile, refund processes for prior tariffs began on 4 March 2026 at the US Court of International Trade.