 Later that year, the assistant imperial censor Quan Wanji (權萬紀) accused Fang and Wang Gui of being partial in their selections of officials, and Emperor Taizong initially ordered Hou to investigate.However, with the urging of another chancellor, Wei Zheng, who pointed out that Fang and Wang were trusted officials given important responsibilities, and it was inappropriate to pick on details of what they did, Emperor Taizong stopped the investigation.In 630, when Emperor Taizong began to have his crown prince Li Chengqian formally rule on a number of matters of state, he commissioned Fang and Li Gang (李綱) to sit with the Crown Prince and assist him in making the decisions.