Trump's 50% tariffs on metals come into effect11 hours ago Share Save Natalie Sherman BBC News Share SaveGetty ImagesUS President Donald Trump has signed an order doubling tariffs on steel and aluminium imports from 25% to 50%. Trump has said the measures, which came into effect on Wednesday, are intended to secure the future of the American steel industry. During his first term, Trump imposed tariffs of 25% on steel and 10% on aluminium, citing a law that gives him authority to protect industries considered vital to national security. His office said it was "pleased" that the trade talks had protected UK steel from the latest duties. "The introduction of 50% tariffs immediately puts the shutters up," he said.