Conversation with Tsai Ing-wen thought to be first between US and Taiwanese leaders since ties cut in 1979 at China's behest China has lodged "solemn representations" with the US over a call between the president-elect, Donald Trump, and Taiwan's leader, Tsai Ing-wen. Trump looked to have sparked a potentially damaging diplomatic row with Beijing on Friday after speaking to the Taiwanese president on the telephone.