Chandigarh, Oct 28 (UNI) Senior BJP leader and MLA Ram Kumar Gautam on Wednesday launched a sharp attack on Congress president Mallikarjun Kharge and other party leaders, demanding an apology to the nation over their remarks concerning Prime Minister Narendra Modi''s family. He also questioned the Congress''s opposition to the Special Intensive Revision (SIR) of electoral rolls, noting that the exercise had been conducted eight times during Congress rule.