ISLAMABAD: Pakistan Muslim League (Nawaz) Senior Leader Malik Mehrban lauded the unforgettable role of late Pakistani Scientist Dr Abdul Qadeer Khan who worked day and night to make Pakistan a nuclear power. Talking to APP here on Monday, he said that as a nation “we must strive hard to make Pakistan an economically independent and welfare state”. Congratulating the nation on “Youm-e-Takbeer“, he said that Pakistan successfully became a nuclear power in the world by detonating five nuclear warheads on May 28, 1998.