The Ulster Unionist and former Stormont Environment Minister Mr Dermot Nesbitt has called on Sinn Féin to reconsider a proposal over the naming of Derry City.
Mr Nesbitt warned today that changing the official city title to Derry would be illegal and would leave the city council open to a legal challenge. He said such a move would be "divisive and wrong".
He said Sinn Féin's proposal was based on "an unwillingness to accommodate Protestants and unionists" and he called on the SDLP to oppose the change.
He said "The SDLP are fond of preaching equality and rights and tonight's debate offers them a great opportunity to put their words into action".
Derry City's name has long been contentious since the city's name was changed to "Londonderry" by the British with the granting of a new royal charter in 1613 during the Plantation of Ulster.
Historically, nationalists have referred to the city by its original name of Derry; unionists referred to it as Londonderry.
Sinn Féin hopes to bring the motion before the Council at a meeting tomorrow night and although insisting the move was not political, the party's Mr Barney O'Hagan insists the two names have sent out mixed messages when it came to marketing the city.
However, the understanding is that the city's name can only be changed by the British Queen and would need a recommendation and an act of the London Parliament for it to be changed.