An Uttar Pradesh BJP MLA who has been staunchly defending an aide accused of shooting dead a man in public in Ballia has been asked by the party chief for an explanation. Sources say BJP president JP Nadda has also warned the party's UP chief over the conduct of BJP MLA Surendra Singh. The BJP's notice to the MLA comes four days after his aide, former army man Dhirendra Singh, allegedly shot a villager dead during a Panchayat meeting in the presence of officials and the police.