Another former staffer of Indigenous senator Dorinda Cox has gone public with allegations about her conduct, accusing the WA senator of creating an "aggressive and unhealthy" office environment.

The Australian reports that Lou Hendricks, who resigned as the senator's media advisor earlier this year, issued a statement on Friday detailing the impact of her former boss' alleged conduct on staff.

"I did my best to support colleagues experiencing behaviours that are typically regarded as bullying while also experiencing similar, and trying to keep myself safe too," Ms Hendricks said.

"Staff were anxious, visibly distressed and in some cases speaking about taking their own life which was a huge red flag and demonstrated how seriously their mental health was affected.

"I found it to be an unnecessarily aggressive environment that was unhealthy, draining and unsustainable … No one can work in a hostile environment for long without it taking a significant and devastating toll on their health."

The statement follows comments from Elder Esther Montgomery last week, who described her two months working in Senator Cox's office as a "nightmare".

Several other former staff have provided accounts on the condition of anonymity, describing patterns of aggressive and intimidating behaviour from the senator towards staff. One former staffer described feeling suicidal by the end of her time working in the office.

It is understood that the Parliamentary Workplace Support Service (PWSS) and/or the Australian Greens have received complaints about Senator Cox from six former employees.

More than 20 people have resigned from the Senator's office, which employs a staff of five, since she was sworn into the Senate three years ago.

In her statement, Ms Hendricks said she hoped that going public may spark some improvement in parliamentary workplace culture and systems.

She said she had approached both the PWSS and the Greens party for help and guidance on numerous occasions, and had started a formal complaint process with PWSS.

"It's clear the PWSS has a difficult job. After many months, I formed the opinion that there wasn't much that the PWSS could do to help, other than listening, asking staff what they were doing for 'self-care' and talking about 'cultural diagnostics'," she said.

Senator Cox's office has not responded to questions from National Indigenous Times.

However, on Friday she released a statement apologising for the distress that any shortcomings in her office may have caused.

"Politics is a challenging and high pressure environment, especially as a First Nations Woman with five federal portfolios and competing priorities, including Australia's largest geographical electorate," Senator Cox said.

"There have been many challenges during my first three years in office including the COVID epidemic, taking on the First Nations portfolio alongside the Voice Referendum and leading many significant Committee inquiries. All whilst establishing and recruiting two office based teams to secure my six year term with the ambition of an effective, safe and supportive work environment."

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