A bipartisan group of U.S. senators is asking Disney CEO Bob Chapek and Executive Chairman Robert Iger to explain the studio’s cooperation with the authorities in the Chinese autonomous region of Xinjiang during the production of the Mulan live-action remake, according to NBC News. The Congressional letter is in response to allegations accusing Chinese authorities of detaining an estimated 1 million to 2 million Uighur Muslims, detained in mass internment camps in the Xinjiang region.