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.

President Biden and Chinese President Xi Jinping met for the third and final time on the sidelines of the Asia-Pacific Economic Cooperation summit in Peru on Saturday, in the wake of the U.S.