Nyorai kupfuurira kweiyi ndima - Muna March 2015, Gallagher akagadzwa kuzadza nzvimbo isina kurongwa yakakonzerwa nekurega basa kweSenator Kate Lundy. Akagadzwa Bill Shorten's mumvuri ushumiri gare gare mugore, uye akasarudzwa kuSeneti pachake pachake musarudzo yemubatanidzwa ya2016. Akazosarudzwa kuti ave Manager weOpposition Business muSeneti. Muna Zvita 2017, panguva yedambudziko rekusarudzwa kweparamende
, Gallagher akatumirwa kuDare Repamusoro. Dare rakapa mutongo muna Chivabvu 2018 kuti akarambidzwa kugara muSeneti nekutadza kusiya ugari hwake hweBritain asati asarudzwa musarudzo muna 2016. Akadzokera pachigaro chake chekare cheSeneti musarudzo yemubatanidzwa ya2019.