China's Foreign Ministry said on Monday that Chenyue Mao, the Wells Fargo banker who has been blocked from leaving the country, was involved in a criminal case and obliged to cooperate with the investigation.

A Wells Fargo banker has been blocked from leaving China due to a criminal matter, the country's foreign ministry has confirmed.

Beijing confirmed that China-born, Atlanta-based Mao Chenyue is banned from leaving the country. This comes during a trade war with the Trump administration.