Japan’s Prime Minister Shigeru Ishiba plans to visit the US before the G7 summit to secure a better trade deal.

President Donald Trump said he will increase tariffs on steel and aluminum to 50% from 25%, effective Wednesday, as a way to help protect American workers.

Trump had gone to the plant near Pittsburgh to champion an expected deal between U.S. Steel and Japan’s Nippon Steel Corp. as one that would ensure the iconic American firm remains U.S.-owned and operated, even as many details on the agreement remain vague. He said the steel tariff increase would benefit the new venture’s American operations.