Democratic Unionist leader Ian Paisley is accusing David Trimble of treachery.
Mr Paisley says there is not a shred of evidence that IRA disarmament has taken place.
His comments came after a meeting with General John de Chastelain, head of the decommissioning commission.
He says the general was unable to tell him where the act had taken place, how many weapons were involved and whether it was part of a process of disarmament.
"The answers tonight illustrate how far, in an act of treachery to the law-abiding citizens, David Trimble is prepared to go to keep the charade of the Assembly in place," he said.
Flanked by his colleagues Peter Robinson and Nigel Dodds, who have taken their places in the power-sharing Executive, Mr Paisley contrasted the secrecy of IRA disarmament with the highly public dismantling of military installations.
He said: "Today, the Army had to publicly take down their own armaments for the defence and safety of Ulster people.
"And what have we? We are told now that the British Government and Mr Trimble will settle for a secret place, we don't know where it was, and for a number of arms, we don't know how many," he added.
While anti-Agreement unionists doubted the veracity of the IRA's move, strenuous efforts to shore up the Good Friday Agreement have continued.
The British Government's response to the IRA weapons move gathered momentum with the ongoing demolition of Army lookout posts and bases in south Armagh and Co Derry.