Dar told US ambassador lack of funds may push Pakistan to pursue other aircraft if funding stalemate not resolved.
Aftab Ahmed died while being held for interrogation by Rangers.
Imran Khan cites safety of women as main concern; party sources claim postponement due to rift between event organisers.
The verdict followed a $72 million jury award from the same court in February
Since 2014, Pakistan have managed to win just three out of the ten ODI series they have played.
Iran's Supreme Leader Ayatollah Ali Khamenei on Monday had criticised US activities in the Persian Gulf.