"The WTO decision today significantly weakens the effectiveness of US trade laws," said Thomas J Gibson, CEO and president of American Iron and Steel Institute (AISI).
AISI said the WTO Appellate Body ruled against the US government appeal of a challenge by India earlier this year regarding the International Trade Commission (ITC)'s practice of "cross-cumulating."
Under this process, as mandated by US statute, the impact of dumped and subsidised imports are both taken into consideration when assessing injury in ITC determinations, it said.
"The WTO Appellate Body has once again created an obligation not agreed to by our trade negotiators, and this ruling will make it very difficult for domestic industries to obtain an effective remedy when facing both dumped and subsidised imports at the same time," he said.
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Noting that steel imports captured 30 per cent of the market share last month, Gibson said the ruling "is very detrimental to steel businesses and workers who continue to battle a flood of dumped and subsidised imports coming into this country unfairly - and at record levels."
However, the decision will likely have consequences for a number of other trade cases as well.
The Appellate Body decision also made a number of other rulings affecting Commerce Department practice, and AISI is currently evaluating the significance of those rulings, it said.