The MEP, Avril Doyle, who is president of the Equestrian Federation of Ireland, has described as devastating the controversy arising out of positive drug test results for two horses used by the Athens Olympic showjumping gold medallist Cian O'Connor.
Speaking on RTÉ Radio, Ms Doyle said Mr O'Connor did not deserve what she called trial by media.
She said it will be some weeks before due process in the case is completed.
Earlier today, Mr O'Connor again denied any wrongdoing. Speaking on RTÉ Radio, he said he had nothing to hide and that he wanted the truth to come out.
Yesterday, he admitted that another of his horses tested positive for a banned substance. The horse, ABC Landlibe, tested positive after a show in Rome last May.