Taiwanese President Tsai Ing-wen arrived on the U.S. Pacific island of Guam on Friday on her way back from visiting diplomatic allies in the Pacific — a trip that caused strong objections from China.

Beijing had urged the United States not to allow Tsai to transit its territory on her trip, which included two days in Hawaii before she headed on to Tuvalu, the Solomon Islands and the Marshall Islands.

The timing is particularly touchy because U.S. President Donald Trump will visit Beijing in the coming week.