Trump sent the proposed agreement to Congress in August, opening a 90-day window for lawmakers’ review and giving them an opportunity to try to pass a resolution of disapproval.

Democrats and nonproliferation advocates have criticized the nuclear pact for not barring ​Saudi Arabia from enriching uranium or reprocessing nuclear waste, two potential pathways to a nuclear weapon. The United Arab Emirates agreed to such measures, known as the gold standard, in its 2009 civil nuclear deal with Washington.