He definitely needs to relinquish his role. This is because he cannot, as the Jubilee majority leader, continue to contradict his party leader, President Uhuru Kenyatta, who is also the head of Government.
By virtue of his position in the Senate, Mr Murkomen in the eyes of a majority of Kenyans represents the Government. This means that whatever he says is presumed to be the stand point of the same Jubilee administration he represents.