Leanne Castley, a former leader of the Canberra Liberals, has resigned from the party to sit as an independent on the crossbench for the remainder of the term. Ms. Castley, who has represented Yerrabi since 2020, stated that her decision follows 18 months of what she described as a “toxic culture” within the organization.
Detailing her reasons for the departure, Ms. Castley reported experiencing “bullying, intimidation, lies, and even a threat of physical assault.” She indicated that she has formally referred the matter regarding physical violence to the party. While she declined to name specific individuals, she emphasized that the issues were not isolated to a single person or event, but rather part of an “18-month campaign” of constant undermining.
Party Leadership Response
Current Canberra Liberals leader Mark Parton addressed the resignation, describing it as “a bump in the road” for the party. Mr. Parton stated that he would not comment on the “individual matters” raised by Ms. Castley, noting that he does not condone bullying or intimidation. He rejected the characterization of the party as having a toxic culture, instead describing the organization as a “robust environment” where individuals hold strong opinions.

Ms. Castley’s tenure as leader began in October 2024 following the party’s loss in the election and concluded in November 2025 when she stepped down. During her leadership, she faced criticism for decisions that led to the indefinite suspension of members Elizabeth Lee and Peter Cain from the party room, a move that was later reversed by Mr. Parton.
Did You Know?
Leanne Castley first joined the Canberra Liberals in 2020 as a member for Yerrabi before taking on the role of party leader in October 2024.
Implications for the Assembly
Despite the high-profile exit, Mr. Parton suggested that the move is unlikely to significantly alter outcomes in the assembly, noting that he expects Ms. Castley to remain “on the same page” with the party on most issues. For her part, Ms. Castley stated that she intends to continue representing Yerrabi with her existing values, explicitly denying rumors that she plans to join other political parties, such as One Nation.
Expert Insight:
The resignation of a former leader to the crossbench creates a complex dynamic within the legislature. While Ms. Castley maintains that she will continue to advocate for her core values as an independent, the loss of a former leader signals internal fractures that could influence party cohesion and the focus of the opposition in the coming months.
Frequently Asked Questions
Why did Leanne Castley resign from the Canberra Liberals?
Ms. Castley stated she resigned because she had “simply had enough of being part of an organisation with such a toxic culture,” citing bullying, intimidation, and a threat of physical assault.

Will Leanne Castley be joining another political party?
No. Ms. Castley stated she has had no conversations with other political parties and intends to move forward as an independent member for Yerrabi.
How has the current party leadership responded to the allegations?
Mark Parton rejected the allegations of a toxic culture, describing the party as a “robust environment,” and stated he would not comment on the specific individual matters raised by Ms. Castley.
How do you believe the shift of a former leader to the crossbench will impact the legislative priorities of the Canberra assembly?





