However, BJP state president Mangal Pandey said that he was hopeful that Choubey will not go against the party.
Choubey was upset after he was denied a ticket to contest the Lok Sabha polls.
BJP fielded another leader Ashwini Kumar Chaubey who was health minister in the Nitish Kumar government and hails from Bhagalpur.
Choubey told IANS over telephone Thursday that Buxar will witness a fight between the "Asli" (real) BJP candidate and "Nakli" (fake) BJP candidate.
"I have resigned from the BJP and am announcing that I will contest as an independent from Buxar," Choubey said.
