The Trump administration scored a victory against Mexico this week in a longstanding trade battle.

The U.S. and Mexico have been locked in a dispute over how tuna is fished in Mexico. The U.S. claims that Mexican fishermen allow dolphins to be netted and killed when they fish for tuna. Therefore, U.S. officials say that Mexican tuna fish can’t be labeled “dolphin safe.”

Mexican leaders deny that the country’s fishing industry isn’t in compliance with rules imposed by the World Trade Organization and they demand their tuna get the “dolphin-safe” labeling. If it doesn’t get that label, several major U.S. supermarkets, like Walmart, won’t sell it, even though it can still legally cross the border.

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“I am pleased that WTO panels have finally agreed with the overwhelming evidence that U.S. dolphin-safe labeling requirements are accurate and fair,” U.S. Trade Representative Robert Lighthizer said in a statement.