ABC Online | Peter Costello says backpacker tax a waste of time; One Nation has 'mainstreamed itself' ABC Online Former treasurer Peter Costello has criticised members of Federal Parliament for wasting so much time debating the backpacker tax. Key points: Backpacker tax "not a major economic issue" and won't impact budget deficit, Peter Costello says; Former ... One Nation 'now mainstream': Costello Costello says One Nation now mainstream |