Aluminum cast or smelt in China, Russia, Iran or Belarus that arrives via Mexico will face a 10% tariff, she said. The measures take effect Wednesday.

The moves, made jointly with Mexican President Andres Manuel Lopez Obrador, follow a broader announcement on tariffs targeting China. The White House is looking to head off what it fears could be a flood of steel and aluminum products from oversupply in China, the world’s second largest economy.

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