WASHINGTON — A Tennessee factory that Washington had hoped 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. Reuters was not able to confirm the names of the two customers. The move follows a White House proclamation last month that seeks to incentivize purchases of American polysilicon, the sources said, declining to be named because the matter was not public. Wacker did not comment on the loss of customers or potential plant closure. It said it was too soon to assess the policy's impact on its business but noted the proclamation "does not, as it reads now, effectively support the use of U.S. made polysilicon." The company also said it was in active discussions wit