Most developed countries are below replacement level in births and have been that way for a generation. Even China is not increasing its population through birth, but through increased lifespan. The urbanization of the developing world going on right now puts people into cramped high rises with little room for large families, so the trend will continue in the developing world for the foreseeable future.
There is no need for any top down population policies anywhere.
The key word there is “developed”. If he has some idea of castrating Mid East natives, I say “hop to it” and as far as I'm concerned he can start with that little “Am-a-nut-job” in Iran.