WASHINGTON (Reuters) - U.S. President Donald Trump on Friday said he planned to increase tariffs on foreign imports of steel from 25% to 50%, ratcheting up pressure on global steel producers and vowing to deepen his trade war.

"We are going to be imposing a 25% increase. We're going to bring it from 25% to 50% the tariffs on steel into the United States of America, which will even further secure the steel industry in the United States," he said at a rally in Pennsylvania.