WEB DESK, July 21(ABC): Bakhtawar Bhutto-Zardari, the daughter of PPP Co-chairperson Asif Ali Zardari, hit back at PTI Chairperson Imran Khan for levelling allegations against the former president. The former prime minister had alleged that Zardari was the “main architect” behind the alleged horse-trading in Lahore, adding that the former president has secured an “NRO for his corruption and purchases …