TAIPEI—Three U.S. senators will visit Taiwan on Sunday and will meet President Tsai Ing-wen to discuss security and other issues, Taiwan’s government and the de facto U.S. embassy in Taipei said on Saturday, a trip that will likely irritate China. The United States, like most countries, has no formal diplomatic ties with the island that…

TAIPEI—Three U.S. senators will visit Taiwan on Sunday and will meet President Tsai Ing-wen to discuss security and other issues, Taiwan’s government and the de facto U.S. embassy in Taipei said on Saturday, a trip that will likely irritate the Chinese regime in Beijing. The United States, like most countries, maintains unofficial diplomatic ties with…