China's commerce ministry on Saturday urged the United States to stop expanding restrictions on American investments in China, stating that a proposed rule on sensitive technologies would disrupt trade ties. The U.S. Treasury Department issued proposals on Thursday to update its outbound-investment security program, adding biotechnology to restricted sectors and expanding coverage of high-performance computing and hypersonic systems. Beijing firmly opposed the proposal, calling it "discriminatory" and reserving the right to take unspecified countermeasures.