克里：不要在谈判之际对伊朗实施新制裁

U.S. Secretary of State John Kerry will caution lawmakers Wednesday against imposing new sanctions against Iran while international negotiations over its nuclear program continue.

Kerry is scheduled to brief the Senate banking committee, and State Department spokeswoman Jen Psaki says he will express that enacting new sanctions at this time would be a mistake.

Officials from both Iran and the P5+1 group that includes the United States, Britain, France, China, Russia and Germany have expressed optimism about their latest round of negotiations, despite failing so far to agree on a deal.  The talks will continue next week.