The President of Papua New Guinea's ruling National Alliance Party, Simon Takep Kaiwi, has written an open letter to the editor of the Post-Courier accusing him of loose reporting ethics.
The letter relates to two front page stories run by the Post-Courier earlier this week.
The Post-Courier printed excerpts of an alleged letter the Deputy Prime Minister Puka Temu wrote to former Chief Ombudsman Ila Geno asking the commission to investigate the Prime Minister, Sir Michael Somare, for breaches of the Leadership Code.
Dr Temu has denied writing the letter, saying it was an attack by political opportunists to destabilise the government.
The National Alliance Party claims the paper is no longer concerned about truth, leading to journalism that is lazy and lacking ethical integrity.
He accuses the paper of misleading the public and causing them to turn against a legitimately elected government.
Sir Michael is currently in Malaysia and has not commented on the events.