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

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.

Chenyue Mao has been blocked from leaving the country because she “is involved in a criminal case,” China’s Foreign Ministry said.