 Complete the following phrase:  an Indian politician, serving as the Member of Parliament, Rajya Sabha from Delhi, since 2018. He is the national spokesperson for the Aam Aadmi Party and the state-in-charge for Uttar Pradesh, Orissa and Rajasthan. Singh has been a senior leader of the party since its inception in November 2012, and is a member of the partys foremost decision-making body, the Political Affairs Committee PAC. He joined hands with Delhi Chief Minister Arvind Kejriwal in his apolitical campaigns from the Right To Information campaign in 2006 to the 