Letters written by liquor tycoon Vijay Mallya to the Congress-led UPA government between 2011 and 2013 have set off a new political fight ahead of the Budget. The letters were held up by the BJP today as proof that former Prime Minister Manmohan Singh and his Finance Minister P Chidambaram helped Mr Mallya get loans even with his poor credit record. The BJP said after Mr Mallya's many letters, the UPA government facilitated loans to the businessman's now-defunct Kingfisher Airlines from a consortium of banks.