Nuclear weapons are so easy to make that no determined nation can be forcibly prevented from making them short of regime change imposed by invasion and military occupation. That, apparently, is one of the options the Pentagon still has on the table for dealing with Iran, and the only one that would work.
Short of that, Israel may have to learn to live with the threat of nuclear annihilation by Iran, just as every Middle East nation has had to live with the threat of nuclear annihilation by Israel for the past four decades. It is hard to imagine a bombing campaign that would eliminate Iran's ability to produce nuclear weapons. If Israel bombs Iran it will be merely an attempt to drag the U.S. into an all-out war with Iran.
It is worth noting that Iran is still a ratified member of the Treaty on the Non-Proliferation of Nuclear Weapons and claims that all its nuclear activities are peaceful and are allowed under the Treaty, accusations that Iran is cheating notwithstanding.
Meanwhile, Israel openly defies the Treaty by refusing to sign it.
An even-handed approach, with a better chance of success than the current saber rattling, is for the U.S. to remove its nuclear weapons from Turkey and tell Israel to lose its nukes and sign the Treaty.
In that case, pressure on Iran will be aimed at preserving a nuclear-weapons-free Middle East, not preserving a U.S.-Israeli nuclear weapons monopoly in the region, as it is today.
Howard Morland, a freelance writer and peace activist who lives near the Pentagon, wrote The Progressive's 1979 article on the Hydrogen Bomb.