South West MLC Adele Farina has been 'deprived' of her seat at the next state election after the WA Labor Party dropped her from preselection in favour of Alannah MacTiernan.
Ms Farina said it was deeply disappointing to her after 19 years of faithful service and hard work in the electorate and Parliament.
"However, it was no surprise," she said.
"It has been common knowledge in the electorate for months now that I was to be the victim of a factional deal to give Alannah MacTiernan's safe city seat to the Left faction's Pierre Yang and give my seat to Ms MacTiernan.
"The Left faction does not believe that Mr Yang, despite the huge popularity of the Premier and the government and Mr Yang's recruiting efforts, will be able to hold his current seat.
"It is particularly disappointing that preselections have been rushed through the Administrative Committee five days before the party resumes normal business after the COVID-19 restrictions.
"By doing so, a ballot of the party rank and file has been avoided, depriving South West Labor Party members a vote and an opportunity to express their view of this factional deal.
"It is personally disappointing Ms MacTiernan, whom I have strongly supported throughout her career, and who has campaigned for party rank and file participation in preselections and against this kind of deal-making by faction leaders, has willingly been involved in this cynical factional exercise.
"Despite my disappointment, I accept the decision of the Administrative Committee and will continue my hard work representing the people of the South West for the remainder of my parliamentary term.
"The South West has been my life. I have given it 100 per cent. It deserves nothing less."
Premier Mark McGowan said party preselections were managed by WA Labor.
"Adele has had a long career representing the South West community. I thank her for her service to the community and in Parliament, and I wish her all the best in the future," he said.