Two Princes: Jared Kushner and Mohammed bin Salman

A year ago this month, Jared Kushner took an unannounced trip to Riyadh, the capital of Saudi Arabia, to pay a visit to his friend Crown Prince Mohammed bin Salman bin Abdulaziz Al Saud, aka MbS. The two men had “forged a bond” since spending time together in Washington the previous March, speaking frequently on the telephone.

And why not? Aside from obvious differences—one was an Orthodox Jew, the other lived in a country where being an Orthodox Jew was illegal—they had much in common. They w...