各立门户gè lì mén hù

indulge in factionalism
❍ 牛僧孺在朝，与李德裕～，为党争，…… (鲁迅《中国小说史略》72) When Niu Sengru was at court he had a rival in Li Deyu,and the factions of these two ministers warred against each other.
❍ 朕切望文武臣工，不论在朝在外，都能和衷共济，万不要～，徒事攻讦。(姚雪垠《李自成》Ⅱ—789) I sincerely hope that you will unite and co-operate instead of indulging in this factionalism and infighting.