A former IAS officer who spent years in Prime Minister Narendra Modi's team and is among his most trusted aides, joined the BJP today. Arvind Kumar Sharma joined the party in Uttar Pradesh's Lucknow. Mr Sharma is tipped for the UP Legislative Council and may be given an important post in the government of Yogi Adityanath. Elections to the 12 seats of the Legislative Council are due on January 28.