"“All I can say is that it was used in the Spanish Inquisition, it was used in Pol Pot’s genocide in Cambodia, and there are reports that it is being used against Buddhist monks today,” Mr. McCain, who spent more than five years in a North Vietnamese prison camp, said in a telephone interview. Of presidential candidates like Mr. Giuliani, who say that they are unsure whether waterboarding is torture, Mr. McCain said: “They should know what it is. It is not a complicated procedure. It is torture.”"