Papua New Guinea's Morobe Provincial Government is to challenge the legality of the election of Prime Minister Sir Michael Somare in court.
Governor Luther Wenge says the election of the prime minister was allegedly inconsistent with the Constitution.
Mr Wenge says the legal battle is aimed at correcting procedures followed in the election.
The court case will also look at the Political Parties Integrity Law, which the Governor says was harsh to elected leaders and has caused so much instability in the country's leadership.
Mr Wenge says the manner in which the Prime Minister was elected as provided under the Integrity Law is inconsistent with the Constitution.
He says as a result that election was unconstitutional so they are going to challenge and correct it.
The provincial government will file the case in the Supreme Court on Monday.