World Bulletin / News Desk

Israeli Prime Minister Benjamin Netanyahu will warn US President Barack Obama at a meeting on Monday that Iran's diplomatic "sweet talk" cannot be trusted and will urge him to pressure Tehran to prevent it being able to make a nuclear bomb.

They will meet at the White House three days after Obama and Iranian President Hassan Rouhani spoke by telephone - the highest-level contact between the countries in more than three decades - fueling hopes for a resolution of a decade-old Iranian nuclear standoff.

"Netanyahu does not care that he is the only one ruining the party," an Israeli official said.

Obama is expected to voice sympathy for Israel's skepticism about Iran, its arch-foe, but will make clear his determination to test Rouhani's intentions and will press Netanyahu for time to do so, U.S. officials say.

For his part, Netanyahu will tell Obama that tough economic sanctions have succeeded in forcing Iran back to the negotiating table and "they should not be eased, quite the contrary, they should be tightened," a second Israeli official said.

Netanyahu will urge Obama to reject any deal that calls for concessions by the West and instead demand specific steps by Iran, including shutting down their uranium enrichment and plutonium projects and shipping out their fissile material stocks.

"He will tell the president 'better no deal than a bad deal,'" the official said.

The Obama administration has been vague on exactly what concessions it wants from Iran, and a source close to the White House said the president is expected to resist Israeli pressure for a precise time limit for diplomacy to produce an agreement.

Despite their differences behind closed doors, Obama and Netanyahu are expected to try to project unity. Talks begin in the Oval Office at 11:15 a.m. EDT, ending with statements to a small pool of journalists, followed by a working lunch.

Netanyahu spent Sunday holed up at his New York hotel working on a speech he will deliver at theUnited Nations on Tuesday while his aides refrained from their usual Sunday television interviews with the Israeli media.

"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 the United States.