The U.S. Supreme Court ruled in a 6-3 decision that former President Donald Trump's implementation of tariffs was unconstitutional as he did not have the authority to impose them unilaterally without Congressional approval. The case centered around Trump's claim of a national emergency that allowed him to invoke the International Emergency Economic Powers Act (IEEPA) from 1977, which permits the president to take extraordinary measures related to foreign threats. However, the Court found that Trump's use of this law was not justified and highlighted that tariffs and taxes are meant to be legislated by Congress.

The ruling marks a significant legal setback for Trump, who has characterized the tariffs as essential for national security and economic protection against foreign adversaries. He argued that the decision undermines the executive power and is a politically motivated attack against him. Following the ruling, Trump expressed his dissatisfaction, deeming it "a shame" during a governors' breakfast meeting, and spoke about preparing a "plan B" in response to the Court's decision.

This Supreme Court ruling could have wider implications on executive powers, particularly on how future presidents may implement economic measures in response to perceived national emergencies. The decision reinforces the importance of Congressional oversight in matters of tariffs and taxation, emphasizing the system of checks and balances integral to the American political framework. With the ruling's impact unfolding, it could influence future debates on trade policies and the extent of presidential powers in economic matters.