Meanwhile, Spain's chief state prosecutor has also said that there could be enough evidence to investigate the allegations against the PP, to see if anything illegal has taken place.

BBC: Q&A: Spain's opposition tells PM to go

Spain's chief prosecutor has said there could be enough evidence to investigate the allegations. but the PP has said it will take legal action against those responsible for what it says is a smear campaign, while announcing an internal audit of its finances.

BBC: Spain's PM Mariano Rajoy pledges to battle on