And where would the Pakis get it?
Muslims don’t do for themselves on anything more complicated than chipping rocks or basic blacksmithing.
Pakistan began development of nuclear weapons in January 1972 under Prime Minister Zulfikar Ali Bhutto, who delegated the program to the Chairman of the Pakistan Atomic Energy Commission (PAEC) Munir Ahmad Khan with a commitment to having the bomb ready by the end of 1976.
https://en.m.wikipedia.org/wiki/Pakistan_and_weapons_of_mass_destruction