"In the interest of transparency, Government of India should release the letters written to the UK Chancellor on the Lalit Modi case", Chidambaram, a senior Congress leader, tweeted.
More than two years ago as Finance Minister, Chidambaram had asked the British government why it was not taking action against Modi, former IPL chief, who had taken refuge in London, after he was accused of a wide range of financial impropriety, including money laundering.
Chidambaram had taken up the issue during his meeting with the Chancellor of the Exchequer George Osborne in 2013. He had wanted Britain to deport him as Modi's passport was impounded in India and his UK visa had run out.