WASHINGTON - A Republican senator from Iowa is pleading for an exemption for potash if U.S. President Donald Trump triggers a trade war by imposing steep tariffs on ºÃÉ«tv imports.

Chuck Grassley's agriculture state could be hammered if Trump ultimately moves forward on his plan to impose 25 per cent across-the-board tariffs on all Mexican and ºÃÉ«tv imports, with a lower 10 per cent tariff on ºÃÉ«tv energy.

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