The Rev Ian Paisley last night warned Sinn Fein and Tony Blair there would be no cabinet seat for republicans in a future power sharing government of Northern Ireland unless the IRA had gone out of business.
After the new Northern Ireland Assembly met for the first time since devolution was suspended three-and-a-half years ago, the North Antrim MP said: "If I could get the last drop of blood from the republican stone, then I would do it.
"Let me tell you that without apology when I think of the people that they have murdered, the awful crimes they have committed. The last time I talked to the Prime Minister he said that I am the best Blairite in this House.
"You made a promise to me on the record that there must be a complete doing away with terrorism, with criminal activities and there must be absolute support for the police.
"Let them fulfil it. They haven't done it."
Mr Paisley's ultimatum came after Assembly members were told in a letter read out by the new Speaker Eileen Bell from the Northern Ireland Secretary Peter Hain that they had an opportunity to give politics in the province a new beginning.
While acknowledging that there would be obstacles between now and November 24, the deadline Mr Blair and Irish Taoiseach Bertie Ahern have set for the establishment of an executive, Mr Hain said politicians had to focus on what united them.
"Now is the time for Northern Ireland politicians to shoulder the responsibility for their people's future as they have been elected to do so," he said.
"It is time to open the chap-ter of stability, opportunity and restore devolution in Northern Ireland."
Earlier, Ulster Unionist leader Reg Empey was accused of breaking his own party's rules by forming a new Assembly group with the loyalist Progressive Unionists.
Democratic Unionist deputy leader Peter Robinson said he was told at a meeting with the Northern Ireland Assembly's new Speaker Eileen Bell that Sir Reg and PUP leader David Ervine had formed a new political party in the Assembly when they linked up ahead of the opening session to deny Sinn Fein a future ministry at Stormont.
He said: "They informed us that former members of the Ulster Unionist Party are claiming that all 24 Ulster Unionists and David Ervine had formed a new political party to be known as the Ulster Unionist Party Assembly Group.
"Clearly, therefore, the Ulster Unionist Party as we have known it will have no members in the Assembly and those who were Assembly members will now presumably be expelled from the Ulster Unionist Party for a breach of their own rules which indicate they cannot be members of any other political party.
"This will be the first elected body at Stormont in which the Ulster Unionist Party has no members. It is entirely under-standable that they would wish to disassociate themselves from the Ulster Unionist banner."
An Ulster Unionist spokesman dismissed as nonsense Mr Robinson's claim that Sir Reg had formed a new party at Stormont.
"The Ulster Unionist Party Assembly Group has always been known as that," he said.
"It is part of the Ulster Unionist Party. There is no breach of the party constitution or anything to do with that. It is just nonsense. The only person that is going to a different group is David Ervine.
The main task for the new Assembly will be to meet the British Government's November 24 deadline for the setting up of a multi-party executive at Stormont headed by the DUP and Sinn Fein.