Rohani says "God has accepted the nation's prayers."
Rohani appeared to say that Western sanctions were effective by affecting the lives of ordinary Iranians.
Rohani says a "new chapter" has started and is based on resolving the difficulties in the world.
Rohani says an "unnecessary crisis" has been resolved.
Iranian President Hassan Rohani is also speaking live on state television at this moment.
Obama: "We have come a long way to reach this point...We should seize it."
AFP: Iran state TV airs Obama's nuclear deal statement live.
OBAMA SAYS IF IRAN VIOLATES THE DEAL, THE SAME OPTIONS AVAILABLE TODAY WILL BE THERE FOR FUTURE U.S. PRESIDENTS
Obama says he will veto any legislation that prevents enactment of the deal.
Obama: "I believe it would be irresponsible to walk away from this deal."
"I welcome a robust debate in Congress on this issue" and scrutiny of the details," he says.