The US Supreme Court has concluded that President Donald Trump's implementation of tariffs using an emergency law was unlawful. The case focused on whether the President appropriately invoked the International Emergency Economic Powers Act (IEEPA) of 1977, a law that allows the President to intervene during national economic crises and regulate foreign trade, a power that primarily belongs to Congress.

On August 29, a federal court determined that Trump's use of this law exceeded his authority and was therefore illegal. This ruling follows an ongoing debate regarding the separation of powers in the US government and the extent of executive authority during economic crises, highlighting the challenges associated with unilateral decisions made by the President.

The Justice Department has since appealed the ruling, which raises further questions about the implications of the court's decision on future economic policies and the potential for checks on executive power. As the situation develops, it underscores the importance of adhering to legislative responsibilities in trade regulation and the ongoing tensions between the branches of government in the United States.