John Kerry actually said...

I believe they will be supportive of this, and I was very heartened to see...

This deal is fundamentally and irreparably flawed. I believe it weakens our national security, and it makes the world a more dangerous place...

I hope members of both parties will work with the administration to strengthen our ability to implement the agreement successfully.

If Congress votes to disapprove and manages to override the President's veto, it would very likely dismantle the agreement.