Union Home Minister and BJP candidate from Uttar Pradesh state capital Rajnath Singh will be filing his nomination from Lucknow Parliamentary Seat today. Singh will also be holding a road show from the party office to the collectorate in presence of several senior BJP leaders and NDA alliance leaders. Although the opposition is yet to field a candidate against Singh, sources said that the opposition candidate may be announced in the next 24 hours. The last date to file nominations is April 18.