Ahead of President Donald Trump’s announcement of his hefty metals tariffs, U.S. stocks gave up earlier gains on Thursday. This amid easing concerns that the move could ignite a global trade war. Trump is expected to sign a proclamation imposing tariffs at 03:30 p.m ET. He promised Canada and Mexico would likely be exempted from the tariffs on steel and aluminum imports if they agree on a trade deal with the United States. Trump also said he was sticking with 25 percent tariffs on steel and 10 percent on aluminum.