New Delhi, Jun 17 (PTI) As BJP battled a deepening row involving two of its top leaders Vasundhara Raje and Sushma Swaraj, former Finance Minister P Chidambaram today demanded release of all letters written to British authorities on the Lalit Modi case during the UPA rule which he said will answer accusations against Congress and him.

The Congress also demanded the resignation of the Rajasthan Chief Minister Raje and External Affairs Minister Swaraj for helping Modi, tainted former IPL Commissioner, "an economic offender and a fugitive".

The Congress' escalation of the attack came the morning after Modi's explosive claims that Raje had supported in writing his immigration plea in Britain and that he has a "family" relationship with External Affairs Minister Sushma Swaraj whose husband and daughter had provided legal services "free of cost".

"The complete answer to Mr Lalit Modi's accusations against UPA can be found in the letters to the UK Chancellor.

Release them," Chidambaram, a senior Congress leader, tweeted today.

Lalit Modi in a television interview last night accused Congress and Chidambaram of making him a target of "political vendetta" in the aftermath of Congress leader Shashi Tharoor losing his ministerial job following the IPL scam.

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.