The Globe and Mail reports in its Wednesday edition that Canada and the United States must impose tariffs on vehicles imported from Mexico to force automakers to build new assembly plants in those two countries instead of Mexico, Unifor president Jerry Dias says. The Globe's Greg Keenan writes that increased investment in the auto industry in Mexico caused by the North American free-trade agreement has led to the permanent shutdown of four assembly plants in Canada and 10 in the U.S. in the past decade while eight plants have opened in Mexico. He says, "We really have to isolate Mexico from future investment." Unifor represents workers at Canadian plants operated by Fiat Chrysler Automobiles, Ford Motor and General Motors. Mr. Dias says, "We're going to have to start slapping heavy tariffs on Mexican-built vehicles that are imported into Canada and the U.S." Mr. Dias met last week with U.S. Commerce Secretary Wilbur Ross, who agreed that Mexico is the problem when it comes to auto investment and jobs bypassing the U.S. and Canada. He says Mr. Ross did not support his call for tariffs, "but what he does agree on is that an unfair amount of auto production has gone to Mexico and that has to change."