It never really had a chance to be overridden. The best Congress can do is go on record rejecting the “deal”. That will despite the posturing and preening of Obama and Kerry will have an effect far greater than they will care to admit.
I really believe the “Iran Nuclear Deal is a done deal.
Over the next 7-8 weeks we will hear all the sounds and furies of the Washington Kabuki Theater, but in the end Mitch McConnell and John Boehner will make sure it is confirmed.