Support WBURReport: China continues to subsidize deadly fentanyl exportsPlay03:32Download AudioBrian MannEmily FengApril 16, 2024 SharePresident Biden greets China's President President Xi Jinping Nov. 15, 2023, in California. China has agreed to curtail shipments of the chemicals used to make fentanyl, the drug at the heart of the U.S. overdose epidemic. (AP)