In his first conversation with the Chinese leader since entering the Oval Office, Mr Trump said he would abide by the diplomatic formula that Beijing and Taipei agreed in 1992, the Financial Times reported ahead of the official White House release.
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Mr Trump had angered China in December by speaking to Tsai Ing-wen, the Taiwanese prime minister, in what was the first conservation between a U.S. president or president-elect and a Taiwanese leader since Washington and Beijing established diplomatic relations in 1979.