Following this, SASAKI, along with Tateki TANI and Nagazane MOTODA, spearheaded the 'Direct Imperial Rule Movement' in and around the Imperial Court and Chamber of Elders, called the 'Chusei Party' (sitting politically midway between the those advocating the Meiji oligarchy and those pushing for freedom and peoples' rights) for taking action to remove the authority of important government men such as Hirobumi ITO and embracing Emperor Meiji.
その後、宮中や元老院(日本)を舞台に谷干城・元田永孚らともに「天皇親政運動」を主導して、明治天皇を擁して伊藤博文ら政府要人の排除に動いたために「中正党」と称された。