President Trump, citing national security concerns, is ordering new tariffs on steel and aluminum today with temporary exemptions for Canada and Mexico and potential exemptions for other U.S. allies on a case-by-case basis. A senior administration official said Trump will sign two proclamations today: one ordering a 25 percent tariff on imported steel, the other ordering 10 percent for aluminum. “This is a promise made, this is a promise kept,” the official told reporters. The tariffs are set to go...