A US federal appeals court has ruled that most tariffs imposed by President Trump under emergency powers were illegal, challenging the core of his trade policy. The court stated that the President exceeded his authority under the International Emergency Economic Powers Act (IEEPA) as the law does not explicitly grant the power to impose tariffs. A US federal appeals court has ruled that most tariffs imposed by President Trump under emergency powers were illegal, challenging the core of his trade policy. The court stated that the President exceeded his authority under the International Emergency Economic Powers Act (IEEPA) as the law does not explicitly grant the power to impose tariffs.