Canada challenges U.S. steel, aluminum duties at the WTO

Canada has challenged the new U.S. tariffs on steel and aluminum at the World Trade Organization, arguing the duties violate WTO rules even as the Trump administration defends them as critical for U.S. national security. The Trump administration imposed 25 percent tariffs on steel and aluminum imports under Section 232 of the Trade Expansion Act of 1962; the duties went into effect on Wednesday. Canada has denounced the new tariffs and imposed retaliatory measures . Canada also has requested consultations...