John Kerry actually said...

"The moment they doubt that and lose faith in that, then the economic incentives many of them have not to abide by the sanctions regime may start to gain greater force."

"If we thought it was necessary or indeed helpful to have it, to have these additional sanctions during the pendency of the negotiations, we would be the first to welcome it."

"If our international partners believe that the United States has acted prematurely by adding new sanctions now in the absence of a provocation or a violation by Iran, their willingness to enforce the ..."

"our negotiation is calculated to make sure they can't get a nuclear weapon."