China's Commerce Minister Wang Wentao told the head of the World Trade Organization that U.S. tariffs will "inflict serious harm" on poor nations, according to a ministry statement released Saturday.

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"These US 'reciprocal tariffs' will inflict serious harm on developing countries, especially the least developed countries, and could even trigger a humanitarian crisis," Mr. Wang told WTO chief Ngozi Okonjo-Iweala in a call on Friday, the statement said.

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"The United States has continuously introduced tariff measures, bringing enormous uncertainty and instability to the world, causing chaos both internationally and domestically within the U.S.," Mr. Wang added.

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