SDLP leader Mark Durkan has hit out at plans for Mr Blair and Mr Bush to meet at Hillsborough Castle, Co Down.
President George W Bush is to travel on Monday to discuss the war in Iraq with the British Prime Minister.
On Tuesday, they're expected to review the North's peace process with the Taoiseach, Bertie Ahern, and the pro-Agreement parties.
It will be the first visit to Ireland by Mr Bush. Both Sinn Féin and the Ulster Unionist party have welcomed the visit.
Mr Durkan said: ‘The SDLP is perturbed. Hillsborough is being used for meetings to plan the further prosecution of the war in Iraq as well as to hold separate discussions on our own situation.
‘I cannot disguise my personal unhappiness at this, given my own opposition to this war and my concern for the integrity of our own peace process.'
The Green Party says it will support protests against the visit and it has called on Sinn Féin leaders not to meet President Bush at Hillsborough.
The Irish Anti-War Movement has called for a national mobilisation against the visit of President Bush.
The Anti war Group ‘US Citizens in Ireland for Alternatives to War’ said it was obscene that George Bush was coming to Ireland to talk about peace while the streets of Baghdad were littered with the murdered corpses of the Bush administration.
SF will attend protest
The Sinn Fein chairman, Mitchel McLaughlin, has said that party members will attend anti-war protests at Hillsborough on Monday.
He said that the party was totally opposed to the invasion of Iraq, although it regarded the engagement of the US Administration in the Northern Peace Process as positive.
He also said that the party would be conveying its opposition to the war directly to President Bush and the British Prime Minister Tony Blair.
