 Yang Xuangan heard rumors of this comment, and was apprehensive of Emperor Yang.As he saw how the imperial governance had deteriorated under Emperor Yang and believed how many officials who were prior subordinates of his father Yang Su would support him, he plotted to depose Emperor Yang and declaring Emperor Yang's nephew Yang Hao the Prince of Qin emperor.As he followed Emperor Yang on a campaign against Tuyuhun in 609, he saw how disorganized the Emperor's train was and considered an ambush at that point, but his uncle Yang Shen (楊慎) dissuaded him from the action.