US President Donald Trump said on Friday that Chinese President Xi Jinping told him China would not invade Taiwan while Trump is in office.

Beijing on Monday said it will “never allow anyone or any force to separate” Taiwan from China, doubling down on its claim over the island separated from the mainland by a waterway.

Taiwan is an internal matter for China, Beijing's foreign ministry said on Monday, in response to U.S. President Donald Trump saying Chinese President Xi Jinping told him he will not invade the island while Trump is in office.