The Sinn Fein president has said he fears the prime minister is moving towards the unionist demand to redefine the IRA ceasefire.

Gerry Adams said the Good Friday Agreement would only work if the rights of all sections of the electorate were upheld.

The West Belfast MP's comments follow calls by DUP minister Nigel Dodds called for Sinn Fein's exclusion from the Northern Ireland Executive.

Mr Adams said the rights of Sinn Fein voters were not an option privilege to be withheld at the behest of another political party.

Adams: Accused David Trimble of making "impossible demands"

He accused the Ulster Unionist leader, David Trimble, of making impossible demands, and continuously trying to renegotiate the Agreement.

He said this was because of infighting within unionism.

Prime Minister Tony Blair pledged to rebuild confidence in the Northern Ireland process after talks with the pro-Agreement parties and Irish premier Bertie Ahern at Hillsborough Castle, County Down, earlier this month.

It is not clear exactly what Mr Blair intends to do, to show that the government is taking a tougher line on paramilitaries.

However, he said he would put forward proposals to the parties before parliament goes into recess on 24 July.

The one thing that we should not do is create a crisis, an unnecessary crisis

Bertie Ahern Taoiseach

Mr Blair has also been warned by the Taoiseach, Bertie Ahern, against creating "unnecessary crisis" by satisfying unionist demands to remove Sinn Fein from the executive.

"I think whatever Tony Blair says next week should be about keeping things going, in my view, and keeping things successfully going but warning people that we do not want any violence," said Mr Ahern.

"The important thing is that we continue to keep the institutions in place and to work our way through whatever difficulties are there.

"I do not accept or believe that the institutions are doing other than a good job - there are always tensions and difficulties."

"The one thing that we should not do is create a crisis - an unnecessary crisis - and while there are difficulties and some tensions I think they will be there for a generation and what we need to do is manage things as they go."

The Ulster Unionist leadership wants the government to acknowledge there is a law and order problem, involving both loyalist and republican paramilitaries.

Ulster Unionists are also demanding that Sinn Fein, as members of the power-sharing executive, be held to account for any breaches of the IRA ceasefire.