One Nation’s predicted primary vote is ahead of both the Labor government and Coalition opposition for the first time, marking a new level of popularity for a party that has sat at the fringe of Australian politics for decades and sparking a flurry of questions about whether Pauline Hanson could actually become prime minister. Josephine Tovey speaks with Mike Ticher, Patrick Keneally and Dan Jervis-Bardy about whether One Nation’s policies will stand up to further scrutiny