The signed US-Saudi 123 agreement on peaceful nuclear cooperation, transmitted to Congress in late August 2026 after July signatures by US and Saudi officials, faces a mandatory 90-day continuous-session review under the Atomic Energy Act before it can enter into force. Traders assign an 89.5% implied probability against entry into force this year amid requirements for congressional inaction on disapproval resolutions, plus White House statements conditioning progress on Saudi normalization with Israel via the Abraham Accords. The deal omits the Additional Protocol and prior enrichment bans, prompting bipartisan scrutiny over proliferation risks and safeguards, while the calendar for continuous session days and potential legislative holds make timely completion unlikely absent rapid political alignment.