Aam Aadmi Party (AAP) leader Arvind Kejriwal will file his nomination today for the high-profile electoral contest in Varanasi where he will face stiff challenge from BJP's prime ministerial candidate Narendra Modi.br br Last month, Mr Kejriwal had announced that he will contest from Varanasi Lok Sabha seat after BJP's decision to field Mr Modi from the city, considered one of the most prestigious constituencies in politically crucial Uttar Pradesh.