Expelled MP Mariameno Kapa-Kingi has filed for an interim injunction, court records show, against Te Pāti Māori President John Tamihere.
The urgent hearing is set to take place tomorrow morning at Wellington's High Court.
Kapa-Kingi has previously said that she would file court action to challenge her expulsion from the party.
She held a hui in Te Tai Tokerau a week ago, which was called by Ngāpuhi.
The hui was not attended by Te Pāti Māori's leadership, despite them being requested to attend.
Tomorrow's hearing comes days before the party was due to hold its annual general meeting in Rotorua on Sunday.
At the AGM, the party's council was planning decide whether or not to formalise the expulsions of Mariameno Kapa-Kingi and Tākuta Ferris.
Weeks-long infighting among the party led to the expulsion of MPs Kapa-Kingi and Takuta Ferris, and fired a petition for party president to resign as well as attempts by iwi leaders to intervene.
Claims of toxicity and a "dictatorship" style leadership within the party first emerged publicly from the MP's son, Eru Kapa-Kingi, as the group he helped lead — Toitu Te Tiriti — emphasised it stood independent from Te Pāti Māori.
When asked if she agreed with her son's statements, Mariameno Kapa-Kingi said: "It's time for change, is what I see. Change is good for us. I think, particularly now."
1News has tried to contact Te Pāti Māori and Kapa-Kingi for a response, but have yet to receive replies.
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