The Papua New Guinea Ombudsman Commission says MPs must respect the rule of law on the Integrity of Political Parties and Candidates.
The Integrity Law was brought in by the previous Government to try to stop the party-hopping which has for many years been blamed for adding to the instability within PNG politics.
The Chief Ombdsman, Ila Geno, says he believes the recent splits within parties, which have seen some MPs siding with the Government and other members joining the Opposition, are illegal.
He says his Commission is calling for the MPs to comply with the Act and for all political parties to remain intact.
"there are rules which are provided for under the Organic Law on the Integrity of Political Parties and Candidates that they must comply with...you know people reckon that it is their democratic right to do whatever they want to do, but we in the institutions like the Ombudsman Commission know you have to comply with the rule of the law"