However, once he had firmer grasp on power, he stopped being as respectful to her and Yang Tong. In summer 619, he sent the officials Duan Da () and Yun Dingxing () to force Yang Tong to yield the throne to him.
Despite increasing his authority, he became less courteous to her and Yang Tong. In June 619, he sent officials Duan Da () and Yun Dingxing () to force Yang Tong to step down and yield the throne to him.