Islamabad- Former Chief Justice Supreme Court, Iftikhar Muhammad Chaudhry, has send defamation notice of Rs. 15 billion to PTI Chief Imran Khan for leveling allegations against him. Talking to media, lawyers representing Ex-CJ said the defamation notice being served to Imran Khan, seeking to apologize within 15 days and withdraw his statement against Iftikhar Chaudhry. PTI chief had accused former chief justice of poll rigging in the 2013 general election.