Taiwan’s Vice Premier Cheng Li-chun is still in Washington leading a trade delegation, extending a fourth round of in-person negotiations with U.S. officials over the size and scope of forthcoming reciprocal tariffs, according to Taiwan’s Executive Yuan and people familiar with the talks. The duties are scheduled to take effect on 1 August under Washington’s new reciprocal-tariff regime. Taipei is pressing for a levy lower than the 15% and 25% rates already announced for Japan and South Korea, while U.S. negotiators are demanding broader access to Taiwanese markets, sources said. The outcome carries heavy economic stakes for Taiwan, whose government says it must protect national and industrial interests, food safety and supply security while deepening cooperation with the United States in technology and security. Separately, Republican Senator Roger Wicker, chair of the Senate Armed Services Committee, will lead a congressional delegation to Taiwan in August, the Financial Times and Reuters reported. The planned visit underscores heightened U.S. political attention on the island as tariff talks enter their final stretch.