Taiwan has told Washington that its proposal to move 40% of the island’s semiconductor supply chain to the U.S. was “impossible,” Taipei’s top tariff trade negotiator said in an interview. Speaking on a local television broadcast Sunday, Vice Premier Cheng Li-chiun said she had made it clear to Washington that the island’s semiconductor ecosystem, built over decades, could not simply be relocated. Taiwan’s international expansion, including its investments in the U.S., is predicated on the notion that the industry remains’ rooted in Taiwan and continues to expand domestic investments, she said in Mandarin, translated by CNBC.