A tariff imposed by Mexico on some agricultural and processed food products is hurting Washington farmers, with potato growers feeling the brunt of the nearly year-old trade dispute.

Mexico last year levied a 20 percent tariff on more than 90 U.S. agricultural and industrial products worth an estimated $2.4 billion. The move came after expiration of a pilot program that allowed a limited number of Mexican trucks access to U.S. highways.

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