Mexico said Wednesday the United States will be shooting itself in the foot if President-elect Donald Trump implements his threats to impose 25-percent tariffs on Mexican imports.He said he would charge 25 percent tariffs on Mexican and Canadian imports and 10 percent on Chinese goods "above any additional tariffs" on the world's second-biggest economy.

The president-elect’s opening salvo in trade and border talks with the United States’ neighbors is casting a harsh light on the North American alliance.