WASHINGTON (TIP) – Since his election in November, President Trump has challenged Beijing over several issues and, most controversially, upended decades of diplomatic protocol by questioning the longstanding US policy towards Taiwan.

In the call, the two leaders discussed “numerous topics,” and Trump committed to honoring the “One China” policy at Xi’s request.

China views Taiwan as a renegade province and, since 1979, the US has acknowledged Beijing’s claim that Taiwan is part of China, with US-China relations governed by the set of protocols known as the “One China” policy.

Prior to taking office, Trump had caused ructions in the US-Sino relationship by taking a phone call from Taiwan’s leader Tsai Ing-wen and, in a January interview in The Wall Street Journal, he said, “Everything is under negotiation, including ‘One China.'”

Thursday’s call was described as “extremely cordial,” and the readout released by the White House said “representatives of the United States and China will engage in discussions and negotiations on various issues of mutual interest.” The two leaders also extended invitations to meet in their respective countries.