Prominent Christian church figures have called on the President, Mrs McAleese, and the Taoiseach, Mr Ahern, to inform President Bush of the Irish people's opposition to the war in Iraq when she meets him during his visit to Ireland this weekend.
The churchmen, who are part of the NGO Peace Alliance, also urged Irish people to join a series of protests in Dublin and Clare during the weekend.
The protests are being organised by the Stop Bush campaign, of which the Peace Alliance is a member.
One of the priests, Father Frank Brady, criticised church leaders for failing to speak out against the Bush administration in moral or ethical terms.
The Dean of Saint Patrick's Cathedral, the Very Rev Robert MacCarthy, said the situation was "worse" than even anti-war protesters had envisaged before the start of the war last year.
"It's worth reminding ourselves the United States is not interested in other parts of the world where there's no oil. For instance in the Sudan, one million people are homeless at this moment because of a corrupt Muslim government."
He also said that Ireland could not claim to be neutral "if it allows the facilities of Shannon Airport to be used by the United States Army".
"You can't have it both ways, and at the moment, Ireland is lined up in effect with the United States and President Bush's administration," said Dean Mac Carthy."
Father Brady, who said he was speaking on his own behalf, accused President Bush of "bearing false witness" in relation to the motivation and conduct of the war.
Between 9,300 and 11,000 Iraqis had been killed, while over 750 US soldiers are dead and a further 4,000 injured, he added.
The conduct of the Bush administration in relation to the war raised a series of moral and ethical questions, he said, and he believed church leaders and academics have been too silent.
"The churches, to my mind, and I may be wrong, have not been prominent in raising these questions."
The Rev Terence McCaughey, a former moderator of the Presbyterian Church, also called on the Bush administration to allow "immediate access" to all the detention facilities such as Guantanamo Bay where the US government is holding prisoners "so that we can see what is happening for ourselves".