Top U.S. and Chinese trade officials are expected to recommit to a Phase 1 trade deal during a review on Saturday, even though China's promised purchases of U.S. exports are far behind schedule.

Current and former U.S. government officials and trade experts in both countries say the Phase 1 deal, signed in January after nearly two years of tit-for-tat tariffs and angry rhetoric, is the one area where the world's two largest economies are still cooperating.

The Trump administration has sanctioned companies and individuals linked to a security crackdown in Hong Kong and human rights, banned a Chinese owned video app, penalized Chinese academics and closed Beijing's consulate in Houston in recent months.