White House spokesperson Josh Earnest said officials do not understand why Trump had a conversation with Taiwanese leader but assured reporters that there would be no change in the official US position on the policy. Officials called that US still adheres to the "One China" policy and highlighted US has not recognized Taiwan as a sovereign state. Earnest added "If the President-elect's team has a different aim, I'll leave it to them to describe.”
On Friday, Trump held the 10-minute phone call with Tsai. There are contradictions about how the phone call happened. Trump tweeted as “The President of Taiwan called me today to wish me congratulations on winning the Presidency. Thank you!” Secondly The Taipei Times reported that the call was arranged by his Taiwan-friendly campaign staff. Moreover Alex Huang who is a spokesperson for Tsai said “Of course both sides agreed ahead of time before making contact."
The Trump transition team said that they noted the close economic, political, and security ties exist between Taiwan and the United States.
USA adopted the 'One China ‘policy in 1972 after meetings between President Richard Nixon and Chairman Mao Tse-tsung had conducted. Later policy was solidified by Jimmy Carter. However UShave retained its unofficial ties with Taiwan.
Over the weekend, Secretary of State John Kerry said it would be "valuable" if President-elect Trump informed current officials about any calls with foreign leaders beforehand. He mentioned that whatever leaders would do, suggestions of government officials have a value. Kerry said “I think that's valuable, and I would certainly recommend it but, obviously, that hasn't happened."