Interior Minister Rehman Malik had offered to resign from his post if it is proved that the American agency Blackwaters personnel are working on Pakistani soil. Now US Defence Secretary Robert Gates has confirmed that Blackwater, and another such agency named DynCorp personnel were, indeed, present in Pakistan. I am sure the minister would not want to challenge the US Defence Secretary on this? Time for him to go -M. RAFIQUE ZAKARIA, Karachi, January 22.