MADRID (Reuters) - Spanish Prime Minister Mariano Rajoy will speak publicly on Saturday regarding media reports alleging that he and other leaders of the ruling People's Party received payments out of a slush fund fed by private donations.

Deputy Prime Minister Soraya Saenz de Santamaria said Rajoy's conduct had always been exemplary. She was speaking at a weekly government news conference.

(Reporting by Andres Gonzalez; Writing by Fiona Ortiz)