Taking the electoral fight to Arvind Kejriwal's home turf, former BJP chief Amit Shah on Wednesday said the Delhi Chief Minister is the "biggest liar" he has seen in his entire life. Addressing his first public meeting in the New Delhi constituency in support of party candidate Sunil Yadav, Mr Shah asked the Delhi Chief Minister if he would give prosecution sanction against JNU student Sharjeel Imam who has been arrested over his controversial "cut off-Assam-from-India" remark.