The Papua New Guinea Opposition Leader, Don Polye, says it will be very difficult for the Government to meet its pledge of millions of dollars of aid to the Pacific.
Mr Polye says the Peter O'Neill Government has committed more than US$100 million in aid to small island nations in the Pacific.
But he says this is one of many promises the prime minister will struggle to keep.
Mr Polye says Mr O'Neill needs to clarify to the people of PNG under what foreign policy, under what Cabinet decision and under what parliamentary budget appropriations did his Government make such a pledge.
He says foreign Governments need to be wary of a leader not acting under the sanction of PNG's legal processes.