His new role as prime minister is in line with the king's previous delegation of duties to him, including representing the kingdom on foreign visits and chairing summits hosted by the kingdom, a Saudi official says.

President Biden raised the matter during a visit to Saudi Arabia where he held a summit with leaders from nine Arab states following a trip to Israel, but left with no public Arab support for a regional security axis.

Minister of State for Foreign Affairs Adel al-Jubeir says the crown prince made the case that trying to impose values by force on other countries could backfire.

On a trip to reset relations with a country he had called a pariah after Khashoggi's killing in 2018, Biden said the crown prince denied involvement in the murder and said he had held those responsible to account.

The US is eager to see Saudi Arabia and its Opec partners pump more oil to help bring down the high cost of gasoline and ease the highest US inflation in four decades.

Bypassing Saudi Arabian airspace had added to flight times and increased fuel burn on some services to and from Israel.

Roughly half that amount will come via direct cash transfers to social security beneficiaries.

Masks are no longer compulsory in most enclosed spaces in Saudi Arabia but they will be mandatory at the Grand Mosque.

Only one million people can join the 2022 season, less than half of pre-pandemic levels, and access is restricted to pilgrims aged 18 to 65 who have been fully vaccinated or immunised against the virus and do not suffer from chronic diseases.

Analysts believe Prince Mohammed came to see if he could win broader backing ahead of a possible new nuclear agreement between world powers and the Saudis' arch-enemy Iran.

The two countries will sign several agreements during his trip as Turkey looks to non-Western partners for financial support as soaring inflation bites.

Analysts and officials say Saudi funding could help boost Turkey's ailing economy.