The proposal to prepare the note — a bureaucratic exercise aimed at fortifying the government's defence — came from the prime minister’s office (PMO) and then cabinet secretary KM Chandrasekhar early this year. Instead, it became a controversial document that provided ammunition for the Opposition to create fissures within the government. The Bharatiya Janata Party on Friday asked Prime Minister Manmohan Singh to clarify his stand on Chidambaram's role in the 2G spectrum case.