The Taoiseach, Mr Ahern, will meet British Prime Minister Tony Blair today amid frantic diplomatic efforts to restore Northern Ireland's Assembly.
The two leaders were due to discuss efforts to revive the Stormont power-sharing executive at a summit in Chequers.
Devolution in Northern Ireland has been suspended since last October amid allegations of an IRA spy ring operating at Stormont.
Mr Blair and Mr Ahern have been involved in discussions in recent days with Sinn Féin leaders Mr Gerry Adams and Mr Martin McGuinness.
However, unionists have been insistent that, if the Assembly is to be restored and Stormont elections are to go ahead in November, there must be a declaration soon from the IRA of an end to all paramilitary activity.
Efforts to restore the Assembly and executive stumbled in May following the cancellation of the Stormont elections.
Mr Blair pulled the plug on the election four days into the campaign because he was not convinced that republicans had provided enough guarantees about an end to all paramilitary activity by the IRA.
Mr Adams had insisted publicly that the IRA would do nothing to undermine the Agreement, but unionists had wanted him and the Provisionals to declare an end to IRA intelligence gathering, weapons procurement, targeting, training, punishment attacks and involvement in all other violence.
In a bid to move the peace process forward, Northern Ireland Secretary Mr Paul Murphy has in recent days announced a four-member commission to monitor the implementation of the Agreement and paramilitary ceasefires.
The commission is made up of two British government nominees, a Dublin and Washington representative
They are: former Northern Ireland Assembly Speaker Lord Alderdice, Mr John Grieve, who headed the Metropolitan Police's anti-terrorist unit, Mr Joe Brosnan, who was an official at the Department of Justice in Dublin and former CIA deputy director Mr Richard Kerr.
Sinn Féin, whose national executive will discuss developments in the peace process in Dublin today, has declared that it will not co-operate with the commission.
The anti-Agreement Democratic Unionists have also been critical of the new body, with East Derry MP Mr Gregory Campbell denouncing it as a "sticking plaster solution which is more damaging than positive for the unionist community".
PA