In elevating his son Prince Mohammed to next in line to the throne, Saudi King Salman approved a strategic realignment with the US under Donald Trump and handed sweeping new powers to the 31-year-old who has been highly critical of regional rival Iran.
Mohammed bin Salman, 31 has been appointed as the kingdom's deputy prime minister and will retain his position as defense minister.
Mr. Trump and the new crown prince pledged "close cooperation" on security and economic issues, according to the White House, and two rulers also discussed the need to cut off support for terrorism, the recent diplomatic dispute with Qatar, and the push to secure peace between Israel and the Palestinians.
One Saudi, Sultan Al Asimi, 33, said in Mecca that Mohammad's appointment sends a message of "hope and trust about the future of the country".
Tikit did not exclude that Mohammad bin Salman Al Saud will follow the policy of the USA and the UAE, which declared "war" against political Islam.
On Wednesday, Saudi King, Salman, crowned his son Mohammed as the next in line to succeed him on the throne.
Iran also reviles bin Salman for his leading role in the Saudi-led military intervention in Yemen, where Saudi Arabia is supporting its internationally-recognized government and Iran is backing the Shi'ite Houthi rebels.
Prince Mohammed bin Nayef, 57, who was wounded in an al-Qaeda assassination attempt in 2009, put down an al Qaeda bombing campaign and kept close ties to the USA intelligence community where he had a reputation as safe and reliable.
Iran's leadership, which called Prince Mohammed's promotion a "soft coup", was critical of comments the prince made last month, with supreme leader Ayatollah Ali Khamenei labeling Saudi leaders as "idiots".
Erdogan and Saudi King Salman bin Abdulaziz will have a face-to-face meeting at the G20 Summit on July 7-8 in Hamburg, Germany.
The young prince, known as M.B.S., emerged from obscurity after his 81-year-old father ascended to the throne in January 2015.
Analysts said the change ends uncertainty over succession and empowers Prince Mohammed bin Salman to move faster with his plan to reduce the kingdom's dependence on oil, which includes the partial privatisation of state oil company Aramco.
Trump and his team see the prince as serious about pursuing economic and social reforms in Saudi Arabia, though they still aren't sure how far or at what pace he is able to proceed, the second official said.