BJP president Rajnath Singh on Saturday filed his nomination papers from the prestigious Lucknow Lok Sabha seat in Uttar Pradesh.Singh, who is a sitting MP from Ghaziabad, filed his nomination papers before the district magistrate and district elections officer Raj Shekhar.br br The BJP president filed four set of papers proposed by Lucknow MP Lalji Tandon, city mayor Dinesh Sharma, former mayor SC Rai and senior counsel of the High Court, LP Misra.