Papua New Guinea's opposition says all signatures of the no confidence motion against the prime minister are in order and that there should not be any excuses to prevent the motion being tested on the floor of parliament.
The opposition leader, Don Polye, says Sir Michael Somare has written to the speaker that he had signed and seconded the motion.
Sir Michael's signature was the subject of deliberation by the in-house committee raising questions on the validity of it.
The acting speaker had put the challenge on hold, saying the signatures needed to be checked.