President Donald Trump said Thursday that the nuclear deal between the United States and Saudi Arabia requires the kingdom to normalize relations with Israel, a significant condition not previously mentioned as the deal was announced.

President Donald Trump on Thursday said an agreement being reached with Saudi Arabia for a civilian nuclear program requires the kingdom to normalize relations with Israel through the Abraham Accords.

Crown Prince Mohammed bin Salman, the kingdom’s de facto leader, has not ruled out the possibility of building nuclear weapons in the future — especially if Iran, Saudi Arabia’s neighbor and longtime ...