Kammala wannan jumla: A ranar 26 ga Afrilu, 1919, PPSD, PPS da Sashen Prussian na PPS sun haɗu don samar da PPS mai haɗin kai. Daszyński ya shiga Babban Majalisar sa kuma ya zama daya daga cikin shugabanninta. Ya kuma shirya littafinsa na Faransanci "Bulletin Official du Parti Socialiste Polonaise" da mujallar mako-mako "Trybuna". Bayan barkewar Yakin Poland-Soviet, Daszyński ya kasance don kammala zaman lafiya da wuri-wuri. Ya yi adawa da ƙirƙirar Majalisar Tsaro ta Kasa, yana kiranta da "taƙaice na Sejm". Koyaya, a ranar 24 ga Yuli ya shiga Gwamnatin Tsaron Kasa ("Rząd Obrony Narodowej") a matsayin Mataimakin Firayim Minista (Witos shi ne Firayim Minista). Ya yi tunanin cewa wannan matakin (gami da shugabannin manoma da na gurguzu) zai kara yawan masu shiga. Bayan nasara a cikin
A lokacin yakin Kogin Niemen, Daszyński ya fi rikici da sauran gwamnati, musamman ma da Ma'aikatar Harkokin Waje. Ya soki ma'aikatan diflomasiyya da manufofin Poland game da Gabas, musamman shirin Tadeusz Rozwadowski na kai hari. A ranar 15 ga Disamba, Babban Kwamitin PPS ya nemi Firayim Minista ya kori Daszyński, amma ya yi murabus a ranar 18 ga Disamba. Firayim Minista ya yarda da shi sosai, yana jinkirta har zuwa 4 ga Janairu, 1921.