The Seiyu-kai Party formed an alliance with Tsuyoshi INUKAI of the Rikken (Constitutional) National Party, led the movement to protect the constitution, and confronted the Third Katsura Cabinet that succeeded the Saionji cabinet.
政友会は立憲国民党の犬養毅らと提携し、護憲運動の陣頭に立ち、西園寺内閣の後任の第3次桂内閣と対立した。