hagatna guam taiwanese president tsai ing-wen arrive u.s. pacific island guam friday way back visit diplomatic ally pacific trip cause strong objections china claim taiwan beijing urge unite state allow tsai transit territory trip include two days hawaii head tuvalu solomon islands marshall islands time particularly touchy u.s. president donald trump due beijing next week china regard self-ruled democratic taiwan sovereign territory regularly call sensitive important issue unite state strongly object transit stop taiwanese presidents office guam governor edward b. calvo describe tsai visit private unofficial provide police escort upon arrival speak banquet tsai say taiwan guam share unique friendship describe guam close part unite state taiwan add people taiwan grateful support jam f. moriarty chairman american institute taiwan u.s. mission taiwan say hawaii guam taiwan bind together pacific ocean also expectation democracy guam home large u.s. military base would key u.s. assistance taiwan event conflict china beijing never renounce possible use force bring island control relations beijing taipei nosedive since tsai elect last year china believe want formal independence taiwan red line beijing part tsai say want maintain peace china defend taiwan democracy security u.s. state department say tsai transit u.s. soil would private unofficial base long-standing u.s. practice consistent unofficial relations taiwan last december trump anger beijing take telephone call tsai shortly win presidential election tsai unite state twice year january stop houston san francisco way latin america taiwan president visit u.s. territory guam despite chinese ire