A former partner of Greens senator Jordon Steele-John has been arrested on stalking and extortion charges.

The 40-year-old woman was charged with one count of aggravated stalking with intent to intimidate the senator and one count of demanding property by written threats.

She is expected to face Perth Magistrates Court on Thursday.

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Senator Steele-John is on leave from the Greens after seven party members penned a letter to leader David Shoebridge on October 15.

They urged him to take action over allegations about the WA senator’s behaviour in the presence of women spanning nearly a decade.

Senator Steele-John vehemently denies any wrongdoing and an independent investigation is being carried out by the WA Greens.

In a lengthy letter posted to his social media three days later, Senator Steele-John accused Senator Shoebridge of effectively forcing him to take leave and said he was the victim of a years-long smear campaign from within the party.

He later clarified he was on leave and did not appear at recent Senate estimates hearings in Canberra, where he is usually prominent as the Greens’ disability spokesman.

AAP has contacted Senator Steele-John for comment on the charges laid against his former partner.

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