Party members announced the move at a press conference earlier Wednesday.
They slammed the use of the Article 44 of the 2014 interim charter to reschedule a timetable for parties to begin preparing for the next election.
They said use of the article contravened criteria set out in the charter and was thus unconstitutional.
They also criticised a junta order requiring party members to confirm their membership, saying it was an infringement of both the parties’ and members’ rights.
It was equivalent to nullifying all memberships, which affected the rights and freedoms of individuals, the party argued.