The U.S. Trade Representative's Office is set to convene a hearing focused on Chinese-made legacy semiconductors, a move that could lead to more tariffs on chips powering everyday items. This investigation, initiated during President Biden's term, seeks to shield American semiconductor producers from China's growing domestic supply chain. Legacy chips, which utilize older manufacturing methods, are embedded in two-thirds of U.S.-based products, as reported by the Commerce Department. Notably, half of the companies in the U.S., including some in defense, are uncertain of the origins of their chips. With older technology involved, these chips are less sophisticated than those designed…