The U.S. tech sector tumbled after Beijing announced new export controls on rare earth minerals, intensifying supply concerns for semiconductor and hardware manufacturers. President Trump accused China of exploiting its dominance in critical materials, escalating trade tensions further. The move deepened Friday’s U.S. stock losses, with chipmakers leading declines amid fears of disrupted production chains. Analysts said the restrictions underscore China’s leverage in the global tech supply ecosystem, amplifying uncertainty across already fragile markets.