BEIJING (Reuters) - China’s Foreign Ministry said on Saturday that it had lodged a protest with the “relevant side” in the United States after President-elect Donald Trump spoke by telephone with the president of self-ruled Taiwan, Tsai Ing-wen. The “one China” principle is the political basis of the China-U.S. relationship, the ministry added, urging the “relevant side” to uphold this policy and carefully handle the Taiwan issue to avoid unnecessary disturbances in ties. 
China lodges protest over Trump call with Taiwan president