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U.S. President Donald Trump signs Section 232 Proclamations on Steel and Aluminum Imports in the Oval Office of the White House on Mar. 8, 2018, in Washington, DC. Trump on Thursday declared the American steel and aluminum industries had been "ravaged by aggressive foreign trade practices" as he signed off on contentious trade tariffs. "It's really an assault on our country," he continued. "I've been talking about this a long time, a lot longer than my political career." (MANDEL NGAN / AFP)