NZ First MP Ron Mark has suggested the Pike River Mine is safe enough for an attempt to be made to recover the bodies of the 29 men killed in the 2010 disaster.
The mine's owner, Solid Energy, decided in 2014 it was too dangerous to enter and the disappointed families of the victims accepted the decision.
In Parliament on Tuesday NZ First MP Ron Mark said recent test results showed gas levels within the mine were safe enough for re-entry.
He asked Prime Minister John Key whether he would take steps to recover the bodies.
Mr Key said advice from Solid Energy was that the environment inside the mine had not materially changed since the decision not to re-enter it was made.
"The decision to enter or not enter the mine is not one which politicians should make, nor have I ever claimed I could make," he said.
"One of the worst things we could do is put the lives of fellow New Zealanders at risk as a result of the tragedy."
Labour MP Damien O'Connor asked why the Government wouldn't fund an independent expert to assess the situation.
Mr Key said he believed he had met all his commitments to the families.