Taiwan’s main opposition leader is due to arrive in the United States late on Monday for a politically sensitive two-week visit expected to attract close scrutiny in Beijing, Taipei and Washington. The Kuomintang delegation, led by the party’s chairwoman Cheng Li-wun, will land on Monday evening local time in San Francisco, where she will visit Taiwanese-American communities and think tanks. She will also travel to Boston and New York before visiting Washington for meetings with political...