The Rev Ian Paisley is facing renewed demands from unionist rivals tonight to reveal his party's plans for securing an end to the IRA.
Following "encouraging talks" with British Prime Minister Tony Blair at Downing Street, the Democratic Unionist leader was challenged to state how he would deliver stable government for Northern Ireland.
Welcoming today's talks, senior Ulster Unionist Mr Dermot Nesbitt said questions still remained about what the DUP could achieve in peace process negotiations.
"Apparently the DUP have proposals that they believe can provide stable and lasting government for Northern Ireland," the South Down Assembly member said.
"One would imagine that a political party with such a miraculous formula would be keen to put it into action as soon as possible, particularly as it could break the current deadlock."
Today's meeting between Mr Blair and the DUP was the first in a series of talks at Downing Street this week ahead of the review of the Belfast Agreement in the New year.
The Taoiseach, Mr Ahern, Sinn Féin, the Ulster Unionists and the SDLP are due to meet Mr Blair in London tomorrow.
Today's discussion was the first between Mr Blair and the DUP since Mr Paisley became the leader of Northern Ireland's largest party.
With London and Dublin seeking Northern Ireland parties' opinions on the review of the Agreement, Mr Paisley said the DUP would be putting forward its proposals soon.
The North Antrim MP also ruled out serving in government with Sinn Féin.
"There will never be any conditions when we will sit in government with any body of people, loyalist or nationalist, who have an army, and that army is being used against democracy," he said.
Mr Nesbitt tonight said it was up to the DUP to finish the work initiated by his party to secure paramilitary "acts of completion".
The former Stormont Environment Minister argued: "We have yet to hear how the DUP propose to get republicans to engage in acts of completion.
"The Ulster Unionist Party had already secured a sanctions mechanism that prevents republican default on their obligations.
"We have in place an effective means of exclusion should it be needed.
"Republicans know that their armed wing has to go away for good."
As they prepared for their talks with Mr Blair, Sinn Féin and the SDLP met in Belfast.
Afterwards Sinn Fein insisted commitments made by the British and Irish governments under the Agreement had to be honoured.
Mr Martin McGuinness said: "In the New Year there will be a clear onus on the two governments and the pro-Agreement parties to come together and ensure that the process of change is not allowed to be stalled any further.
"We need to see the Good Friday Agreement implemented and implemented in full. We want to see the entire Good Friday Agreement package delivered upon. This is our focus in the time ahead."
PA