Former chief of Inter-Services Intelligence (ISI) Lieutenant General Hamid Gul (Retd) has advised Prime Minister Nawaz Sharif to resign after registration of two FIRs against him. Talking to a private TV channel on Tuesday, Gul said that PM had no moral justification to continue after registration of two cases against him. He said that Pakistan Tehreek-e-Insaf (PTI) President, Makhdoom Javed Hashmi gave irresponsible statement against him. "I stopped several martial laws in Pakistan, so how can I talk about it?" Gul said.