Sinn Féin Newry Armagh MP Conor Murphy has said that John Alderdice and the other 3 members of the IMC should resign and the Commission should be scrapped.
Mr Murphy said:
"The IMC was established outside and in breach of the terms of the Good Friday Agreement. It is a tool for the securocrats and the opponents of change. It is not and never has been independent. It is politically biased, has a clear anti Sinn Féin agenda, and its procedures are flawed.
"Sinn Féin has met with the IMC on a number of occasions and challenged each of the members of the Commissioners on their political bias, their lack of independence and their failure to employ any of the normal standards of proof required of other tribunals or similar bodies.
"When we met with the IMC, John Alderdice concealed the fact that he remained a member of the Alliance Party. His resignation from the Alliance Party at the end of last week does not mean that he will suddenly cease to be a political opponent of Sinn Féin.
"Sinn Féin has told both governments that the IMC is a problem which they created and it is one which they must resolve.
"John Alderdice and the other three members of the IMC should resign immediately and the IMC should be scrapped." ENDS