“It must be pointed out that there is only one China in the world,” the Chinese foreign ministry said in a statement on Saturday, according to the Financial Times, which first reported the call between Trump and Taiwan's president Tsai Ing-wen.
China's foreign ministry added it “lodged solemn representations with the US."
It's still unclear if Trump's call–in which Taiwan's president congratulated him–was intended to cause the uproar and signal a new direction in U.S. foreign policy toward China or if Trump had been unaware of the precedent he was toppling.
"We urge the relevant side in the US to adhere to the 'one China' policy, abide by the pledges in the three joint China-US communiques, and handle issues related to Taiwan carefully and properly to avoid causing unnecessary interference to the overall China-U.S. relationship," China's foreign ministry stated.
Trump tried to rationalize his phone call Friday as it was coming under scrutiny.
"The President of Taiwan CALLED ME today to wish me congratulations on winning the Presidency. Thank you,' Trump tweeted.
He then later pointed out that the U.S. sells weapons to Taiwan.
Interesting how the U.S. sells Taiwan billions of dollars of military equipment but I should not accept a congratulatory call.
— Donald J. Trump (@realDonaldTrump) December 3, 2016