Advani served as Minister of Home Affairs in the BJP-led National Democratic Alliance government from 1998 to 2004. He served as 7th Deputy Prime Minister of India from 2002 to 2004 under Atal Bihari Vajpayee. He was the Leader of the Opposition in the 10th Lok Sabha and 14th Lok Sabha. Advani began his political career as a volunteer of Rashtriya Swayamsevak Sangh, a right-wing Hindu nationalist organisation.