Translated into English that means "Allah willing" or "If Allah wills it."
I have two comments.
First, I doubt we would ever hear John Kerry say "It's God's will" or invoke Jesus except when it comes to supporting Obamacare.
Second, even if Allah wills a nuclear deal between the U.S. and Iran, the same cannot be said of the will of the Senate. Of course, the Obama Administration will probably try to get around the Senate. The Obama Administration may answer to the will of Allah, but a Republican administration answers to the will of Americans.