China’s foreign ministry has lodged a formal protest over a call between President-elect Trump and Taiwanese President Tsai Ing-wen, urging the U.S. to abide by the “One China” policy.

“We have already made solemn representations about it to the relevant US side. It must be pointed out that there is only one China in the world. Taiwan is an inalienable part of China’s territory,” China’s Foreign Ministry spokesman Geng Shuang said in a statement Saturday.

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