The decision to reduce the exchange of sensitive information about the Iran talks was prompted by concerns that Netanyahu’s office had given Israeli journalists sensitive details of the U.S. position, including a U.S. offer to allow Iran to enrich uranium with 6,500 or more centrifuges as part of a final deal.

Obama administration officials believed these reports were misleading because the centrifuge numbers are part of a package that includes the size of the Iranian nuclear stockpile and the type of centrifuges that are allowed to operate. A deal that allowed 500 advanced centrifuges and a large stockpile of enriched uranium might put Iran closer to making a bomb than one that permitted 10,000 older machines and a small stockpile, the administration argues.