Exporters of Mexican steel and aluminum are reporting a 63 percent drop in sales to the United States since tariffs went into effect earlier this year.

President Trump has doubled the rate on foreign metals to 50%, saying the levies weren’t high enough to help the U.S. industry.

President Trump signed an order Tuesday doubling tariffs on steel and aluminum imports from 25% to 50% for al trading partners except the U.S. — drawing swift criticism from officials in neighboring Canada and Mexico.