Former Canberra Liberals leader Leanne Castley has resigned from the party and will join the crossbench, sitting as an independent for the rest of the term.In a statement, she said she has "simply had enough of being part of an organisation with such a toxic culture". "In the last 18 months, I have experienced bullying, intimidation, lies, and even a threat of physical assault," she said."I can no longer be part of an organisation which tolerates this conduct."This morning, Ms Castley told 666 ABC Canberra that the bullying, toxicity and "constant undermining" had been prevalent since she was first elected to the leadership in 2024."At some point I had to put a line in the sand and say, okay, I'm walking away."It's distracting and it takes us away from the job that we're elected to do, and I want that focus back."She also confirmed she had referred the matter of the physical threat to the party, and was "still considering" police action.She would not be drawn on naming names, but said the person responsible was still in the party."I'm not going to go into that It's not important, and it's not helpful," Ms Castley said.Current Canberra Liberals leader Mark Parton said he would not comment on the "individual matters" raised by Ms Castley."Where concerns have been raised, they've been treated seriously, but as is the path chosen by Leanne, I'm not going to sit on the radio and comment publicly on individual matters," he told 666 ABC Canberra."We've dealt with it and are dealing with it."He also denied the party had a culture issue, and said that he did not "condone bullying, intimidation or inappropriate behaviour of any kind"."I reject the allegations about the toxic culture of the party," he said."It's a political party