Fresh from a landslide reelection victory, Taiwanese President Tsai Ing-wen met Sunday with the de facto U.S. ambassador to Taipei, as China warned that countries should stick with recognizing communist-ruled Beijing as the rightful government of “one China," including Taiwan. William Brent Christensen, a U.S. diplomat who is director of the American Institute in Taiwan, congratulated Tsai on her victory in Saturday's election, and she thanked him for his support.