WA Greens senator Jordon Steele-John has reiterated he won't be attending parliament next week, after releasing and then deleting a copy of a letter detailing allegations of misconduct against him.

On Friday night the senator took to social media to publish the letter which is addressed to Greens leader David Shoebridge and signed by seven current and former Greens staff or party office bearers.

The writers, who are not named, state they have been made aware of "multiple allegations of serious misconduct" being made against Senator Steele-John "spanning almost a decade (2017-2025)".

"These allegations all concern his behaviour in the presence of women. We are aware of multiple women who have taken up roles or volunteered in the party, who because of these allegations, have been warned not to be alone with him."

The letter, dated October 13, goes on to state the accusations have come from both inside and outside the party, and urges Senator Shoebridge to commission an independent investigation into the allegations, and review and update gendered violence protocols.

Senator Steele-John has repeatedly and strenuously denied the allegations.

On Saturday the 32-year-old senator said a copy of the letter was sent to him by Chief Political Commentator for the Nine papers, James Massola, who then broke the story on October 15.

The senator said he had initially chosen to post the letter on his own social media accounts because he "did not want to be seen as hiding from it".

"I'm now not sure that was the right call and I've taken it down. I'm really sorry for any additional distress it caused," he said, and reiterated his absence from parliament next week.

The WA branch of the Greens has commissioned an independent investigation into the allegations. 

'Growing chorus'

In the days after the allegations became public, Senator Shoebridge initially said he understood Senator Steele-John was taking leave from parliament.

But last Sunday the WA senator denied that was the case in a lengthy open letter, prompting the federal Greens leader to encourage his colleague to take leave.

"I think the community assumptions are that he step aside for the extent of this inquiry and I've communicated that to Jordon," Senator Shoebridge told ABC Radio National Breakfast on Thursday.

In a statement on Saturday, Senator Shoebridge reiterated his view that Senator Steele-John take leave.

"This is in no way a prejudgement of any of these matters," he said.

Senator Steele-John reflected in his post on Friday that there had been a "growing chorus" calling on him to not attend parliament next week, when senate estimates will take place.

"I have explored attending digitally but have been informed that would also be unacceptable," he said.

"The precedent has now been set: any MP can be kept out of parliament by allegations of allegations."