Breaking: One Nation claims victory in Secret Harbour by-election

One Nation is claiming victory in the Secret Harbour by-election, with counting showing it is on track to secure its first ever lower house seat in Western Australia.One Nation's WA leader Rod Caddies claimed victory for the party's candidate Luke Herdegen at 9.30pm local time, although Labor was yet to concede.Luke Herdegen scored One Nation a historic victory in Western Australia. (ABC News: Keane Bourke)Labor's candidate was political staffer-turned-Woodside lobbyist Georgia Tree.The area was traditionally safe Labor territory, having been held in different shapes and under different names since 1989, including most recently by Paul Papalia on an 11.5 per cent margin.WA Labor Premier Roger Cook had repeatedly described the by-election as a "fight for our lives", given the threat posed by One Nation.That the minor party was able to achieve such a large swing in Labor heartland will be watched closely around the country, both as an indication of the support behind One Nation and to learn lessons in how it can be campaigned against.