They were heralded just months ago as "the only people" Pauline Hanson could trust with the task of engineering One Nation's resurgence in Western Australia. Within weeks, the plan was in tatters.

Ron McLean and wife Marye​ Louise Daniels, associates of Senator Hanson for 20 years, were unceremoniously dumped as state president and secretary of One Nation, and expelled from the party.

Now, as the party implodes just days out from the election, the pair have engaged a lawyer to file an anti-discrimination claim against Senator Hanson for allegedly telling Mr McLean he was "too old" to run for a seat.

"She said: 'Ron, I'm sacking you from the position on [the] agriculture [ticket], I believe you're too old and you'll be 91 when the term's finished'," Mr McLean, 87, told reporters at a shambolic media conference on Thursday.