Donald Trump has made a tougher stance toward China central to his pitch on foreign policy, even as Joe Biden and Xi Jinping sought to lower tensions before the next president takes office.

President Joe Biden and his Chinese counterpart, Xi Jinping, closed the book on their diplomatic relationship Saturday, meeting for a final time amid uncertainty over what the next Donald Trump presidency might portend for their two countries’ ties.

In what was the last meeting between Chinese President Xi Jinping and U.S. President Joe Biden as Biden prepares to exit the White House in January, Xi warned Biden to “make the wise choice” to ensure the “peaceful coexistence” of the United States and China.