Peter O'Neill says that the mandate of parliament to elect him as Papua New Guinea's Prime Minister must be adhered to despite his government being declared illegal by the Supreme Court.
Monday's ruling reiterated the court's December decision that Sir Michael Somare is the country's legitimate Prime Minister.
While the Somare group is seeking to be sworn in as caretaker government ahead of next month's election, Peter O'Neill's group is holding a special sitting of parliament to address the ruling.
Mr O'Neill says Sir Michael is being misled by a group that is determined to protect its own interests.
"He needs to appreciate that there is a parliamentary mandate in place. He has always sought power through that in the past. I want to stress here again, that we will welcome any solution that will not undermine the integrity of parliament, that there is stability of the government in place and we are quite happy to talk to him or anybody else for that matter."