KARACHI (AFP/Reuters) - Pakistan on Tuesday angrily rejected leaked documents showing that US investigators considered its top spy agency a terror group, which could further strain relations between the wary allies. The ISI is being wrongfully defamed internationally, Interior Minister Rehman Malik told reporters. While his ministry is responsible for the police and some paramilitary units, ISI is under exclusive control of the military. The ISI is not and has never been involved in politics, Malik said, before adding that the intelligence agency had served Pakistan so tremendously. The ISI is a patriotic organisation which has a huge role in combating terrorism. Those who are trying to bring the ISI into disrepute would never succeed in their design, he said. I request you to rebut the propaganda being done against our intelligence, Malik told reporters. Rebut it forcefully and defend your agencies as the other countries do. This is your national asset and the future of the country. Malik said several tactics have long been used to defame Pakistan and the ISI. Even today, our ISI is being defamed and efforts are being made to implicate it (falsely). I assure you that the work that is being done by your ISI for the country, no one is doing that, he said. The war (on terror) that we are winning, they have a share in it. They have a role in it. Pakistan is a key ally of the United States against the Taliban but deep mistrust between the two countries intelligence agencies was laid bare this week with the leaked documents released by anti-secrecy website WikiLeaks. The exposure of the private US assessment, on a memorandum from the controversial US camp for war prisoners at Guantanamo Bay, may cause new strains in the relationship between the United States and ISI.