A Tennessee factory that Washington hadhoped to protect as part of a push to safeguard the U.S. semiconductor supply chain is at risk of closure after the Trump administration's new trade measures drove away its two remaining customers, according to sources familiar with the matter. Germany's Wacker Chemie, which produces polysilicon that goes into chips and solar panels, will make a decision in the coming weeks on whether to close its Charleston, Tennessee, facility, which employs about 600 workers, the sources said.