By Doina Chiacu and Andrea Shalal WASHINGTON (Reuters) -U.S. President Donald Trump said his proposed 100% tariff on goods from China would not be sustainable, but blamed Beijing for the latest impasse in trade talks that began with Chinese authorities tightening control over rare-earth exports. Asked whether such a high tariff was sustainable and what that might do to the U.S. economy, Trump replied, "It's not sustainable, but that's what the number is." "They forced me to do that," he said in an interview with Fox Business Network that was broadcast on Friday. Trump unveiled additional levies of 100% on imports of Chinese goods a week ago, along with new export controls on "any and all critical software" by November 1, nine days before existing tariff relief was set to expire. The new tr

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