The U.S. said Biden mentioned Ren'ai Reef, Hong Kong and other aspects of China's response during the phone call.

China's Foreign Ministry Spokesperson Wang Wenbin hosted a regular press conference on April 3. China emphasized to the United States that China has indisputable sovereignty over the Nansha Islands and adjacent waters. The root cause of the Second Thomas Shoal issue is that the Philippines has attempted to build permanent outposts on China's uninhabited islands and reefs. China has strong will and determination to safeguard its territorial sovereignty and maritime rights and interests.