By Phil Stewart
JERUSALEM (Reuters) - U.S. Defense Secretary Ash Carter never expected to win over Israel's Prime Minister Benjamin Netanyahu about the merits of the nuclear agreement with Iran but tried to put a brave face on their sometimes blunt, closed-door exchange on Tuesday.
"We don't agree on everything. And the prime minister made it quite clear that he disagreed with us on with respect to the nuclear deal," Carter said at an airbase in Jordan.
"But friends can disagree."
Since arriving in Israel on Sunday, Carter has sought to look beyond the political tensions between Israel and the United States that have only deepened since last week's announcement of a deal curbing Iran's nuclear program.
Carter, the first U.S. cabinet secretary to visit Israel since the deal, traveled to the northern border with Lebanon on Monday and promised to help counter Iranian proxies like Hezbollah.
Israel fears Iran-backed groups like Hezbollah will benefit from Iranian sanctions relief.
Netanyahu looked stern as he received Carter in Jerusalem and the two did not deliver expected public remarks to gathered reporters. Once behind closed doors, the prime minister, without referring to notes, detailed his objections.
"The Secretary did of course respond to those (objections) ... we just agreed to disagree on certain issues," a senior U.S. defense official said, speaking on condition of anonymity to describe the talks.
The official described Netanyahu as "blunt" and "passionate," offering the same kinds of arguments privately that he has made at length in public. In his latest U.S. media offensive, Netanyahu has urged lawmakers to hold out for a better deal.
The U.S. Congress has 60 days from Monday to decide whether to approve or reject the deal. Republicans who control Congress have lined up in opposition, but Obama says he will veto any attempt to block it.
Israel has a strong army, is believed to have the region's only nuclear arsenal, and receives about $3 billion a year in military-related support from the United States.
That amount is expected to increase following the Iran deal, but the U.S. official said that issue did not come up.
"There was no discussion of money at all," the official said.
Carter visited Jordan on Tuesday and will travel next to Saudi Arabia, which is engaged in a contest for power with Iran stretching across the region. Like Israel, Saudi Arabia fears the deal will bolster Iran's allies.
(Reporting by Phil Stewart; Editing by Angus MacSwan)