Senator Barbara Mikulski supports Iran deal
The Democrat from Maryland is the 34th Senator to support the deal. That gives him enough support that Congress can't override the Presidential veto.
Congress has until Sept 17 to pass a resolution to block the deal but if the votes hold up, it will fail and the sanctions will be lifted.
That was likely priced in already but it ensures that Iranian oil will make it back to market. The next question is, how much oil can Iran produce?