Three weeks ago, White House Middle East portfolio holder Brett McGurk visited Muscat. He discussed the possibility of Omani mediation to see if the Iranians would be willing to take steps that would limit their nuclear program and halt escalation in the region.

A spokesman for the White House National Security Council rejected the Israeli officials' claims, saying the U.S. has not discussed an interim agreement with Iran or sanctions relief or closing International Atomic Energy Agency investigations. "The Americans want to get into a poss state when it comes to Iran's nuclear program," said one senior Israeli official.