An Early Happy Implementation Day to Everybody.

"The purpose of Security Council Resolution 2231 [passed July 20] is primarily to endorse the JCPOA, which is itself a legally non-binding agreement, and to implement the actions of the Security Council which were agreed to in the JCPOA. Specifically, the Security Council decides in Resolution 2231 that on Implementation Day, as defined in the JCPOA, the previous resolutions of the Security Council regarding Iran’s nuclear program will be terminated. Implementation Day is scheduled to occur when a number of essential actions are taken by Iran, and by the U.S. and the E.U., as spelled out in Annex V of the JCPOA. Practically speaking, Implementation Day is likely to occur within the next 6-8 months. http://armscontrollaw.com/

HELD: JCPOA is legally binding via UNSCR 2231.

So...What if the Senate rejects it and overrides Obama's veto? I don't know.