The Iran deal is supposed to prevent a nuclear-arms race in the Middle East. So what better way to get that ball of hopefulness rolling than by arming our regional allies to the teeth?

“The U.S. is specifically looking at ways to expedite arms transfers to Arab states in the Persian Gulf and is accelerating plans for them to develop an integrated regional ballistic missile defense capability,” the Journal’s Carol Lee and Gordon Luboldreported Monday. The goal, they add, is to prevent the Saudis “from trying to match Tehran’s...