John Kerry actually said...

"Congress is right to focus on these concerns and to require concrete assurances from the administration that they can be overcome."

"The nuclear deal is certainly not perfect but will freeze Iran's nuclear efforts for a decade or more."

"It weakens us, and it weakens the Israelis."

"Most importantly, the strong restrictions that have effectively frozen Iran's nuclear program since January 2014 would all be lifted if the negotiations are ended."