Saudi Crown Prince Mohammed bin Salman arrived in Egypt on Monday, continuing his first trip overseas since the killing of journalist Jamal Khashoggi in the Saudi consulate in Istanbul drew global condemnation.
Egypt's President Abdel-Fattah al-Sisi said on Tuesday that his country is keen to boost bilateral cooperation with Saudi Arabia, Xinhua reports.
Saudi authorities have blamed the killing on lower-ranking officials who they say exceeded their authority.
"The stability and security of Saudi Arabia is an integral part of Egypt's security", Sisi said.More news: Winter storm causing travel problems in southern Iowa
Tunisia and Saudi Arabia have very different political systems.
The request also aims to investigate bin Salman's alleged involvement in the torture and murder of prominent Saudi journalist Jamal Khashoggi, who was killed in the Saudi consulate in Istanbul in October.
Erdogan and Prince Mohammed will attend the G20 meeting in Argentina later this week.
A day earlier, about 200 protesters gathered in the same spot to say the crown prince wasn't welcome in this North African nation.
The crown prince's visit to Cairo is an important step in promoting strategic relations between the two countries.More news: Cheika explains Ashley-Cooper, Beale omissions
Mohammed's visit is part of a tour of several Arab countries, his first trip overseas since Khashoggi - a sharp critic of Mohammed - was killed inside a Saudi consulate in Turkey on October 2, triggering global condemnations.
In recent years, Saudi Arabia has been planning to begin building a nuclear power plant with the help of USA technology, but earlier this year, Saudi Energy Minister Khalid al-Falih said that the US was not the only option for the Kingdom when it comes to developing nuclear energy projects.
The Tunisian journalists' union sent a letter to the president calling it an "attack on the principles" of the 2011 revolution that brought democracy and freedom of expression to Tunisia.
In an apparent attempt to avoid embarrassing the prince, the presidency only invited photographers to cover his visit.
The focus of the Human Rights Watch complaint is the Saudi-led war in Yemen.More news: No. 1 Duke holds off No. 8 Auburn to reach Maui final
"A decision by Argentine officials to move toward investigation would be a strong signal that even powerful officials like Mohammed bin Salman are not beyond the reach of the law".