If he’s elected in November, Joe Biden says he’ll return America to the 2015 Iran nuclear accord. If so, what does he intend to do about Saudi Arabian nuclear proliferation?

I ask that question, because there’s a very real prospect that renewed U.S. support for the Joint Comprehensive Plan of Action will spark a Saudi rush to nuclear weapons competency. Indeed, Riyadh has already started on that course. As the Wall Street Journal reported on Aug. 4, China is now helping the Saudis develop a civilian nuclear program. It’s not clear why Saudi Arabia, which has the second-largest oil reserves of any nation on Earth, needs a nuclear program. Except, that is, if one considers the objective of such a program is not to produce energy but rather to produce highly enriched materials — the ingredient materials for a nuclear warhead. While Saudi Arabia is not yet pursuing this enrichment, its Chinese engagement proves that Crown Prince Mohammed bin Salman has nuclear concerns high up on his priority list. The Trump administration is rightly concerned.