But Kerry said he will travel to the Gulf to brief leaders on the hard-won accord.

Speaking to press conference after his meeting with his Saudi Arabian counterpart, Foreign Minister Adel al-Jubeir, Kerry said that along with challenges to the security and instability in the region, the US and Saudi Arabia discussed the recently signed nuclear deal with Iran; Syria; Daesh; the challenge in Yemen and what is needed to be done to confront those difficulties.

Israeli Prime Minister Benjamin Netanyahu said that the agreement “repeated the mistakes” of the nuclear deal with North Korea, which subsequently developed nuclear bombs.

Carter is also expected to visit Israel, another vocal opponent of the deal, over the weekend.

State Department spokesman John Kirby said that Netanyahu raised concerns he had expressed publicly, and that Kerry explained why the USA administration believes it is a good deal.

For decades, Saudi Arabia has poured billions of its oil dollars into sympathetic Islamic organizations around the world, quietly practicing checkbook diplomacy to advance its agenda.

The White House meeting was part of Obama’s effort to persuade skeptical allies of the agreement’s value.

Members of the six-nation Gulf Cooperation Council came to the meeting seeking assurances from the White House that the USA was fully committed to the region’s security.

He welcomed a deal with a “robust and continuous inspections regime to make sure Iran does not violate the terms of the agreement”, adding it should also have an effective and quick “snapback” mechanism that allows for sanctions to be quickly reimposed if Tehran violates Tuesday s accord.