Unnerved by the pace of the U.S. outreach to Iran and deeply skeptical of Rouhani, Netanyahu will push Obama for specific steps and deadlines to prevent Tehran from using talks to “run out the clock” while it advances toward making a nuclear weapon.

“I will speak the truth. Facts must be stated in the face of the sweet talk and the blitz of smiles,” Netanyahu said at the airport in Tel Aviv before departing for Washington on Saturday night.

Obama will press Netanyahu for time to test Rouhani’s intentions, while trying to reassure Israel he will not ease sanctions prematurely. He is likely, however, to resist Israeli pressure for a precise time limit for diplomacy with Iran to produce a deal, according to a source close to the White House.

“American and Israeli officials like to say there’s no daylight between them on Iran,” a former U.S. official said. “But with his words alone, Rouhani has opened a window.”…

“It totally suggests that for the president, all options are not on the table with Iran,” said Elliott Abrams, a Middle East adviser under Republican former President George W. Bush, now at the Council on Foreign Relations think tank.