Prince Salman's trip to the Argentine capital Buenos Aires will bring him face to face with world leaders for the first time since the killing of Washington Post journalist Khashoggi.
A Central Intelligence Agency assessment reportedly concluded that Khashoggi's killing inside the Saudi consulate in Istanbul, Turkey could not have happened without the crown prince's order, but Saudi Arabia denies the charges.
Meanwhile advocacy group Human Rights Watch (HRW) wrote to a federal prosecutor arguing that the Argentinian courts should prosecute the crown prince under Argentinian law when he arrives there later this week.
He must now decide if the constitutional definition of universal jurisdiction-which generally allows states to claim authority over crimes committed elsewhere-applies.
President Beji Caid Essebsi's office said Tunisia denounces the journalist's killing and wants a full investigation, but doesn't want the killing to be used to destabilize Saudi Arabia.
According to the source, the Moroccan king decided his country was not ready to host the crown prince "at such a critical juncture", the report said.
In a controversial move a year ago, Trump recognised Jerusalem as Israel's capital and later moved the USA embassy there.
US senator disagrees with Trump over CIA's Khashoggi assessment
In 2016, Mohammed al-Zawari, a Tunisian aviation engineer who the Palestinian group Hamas said was one of its members, was assassinated in his home in Tunisia's coastal region.
It is the crown prince's first trip overseas since Khashoggi's murder early last month, which prompted an global media firestorm that remains ongoing despite the passage of nearly two months.
But Tunisians' anger towards Israel goes beyond a pro-Palestinian sentiment. "And if there are indicators that the prince was involved in this murder then we need to absolutely consider further action".
The official welcome contrasted with hostile protests by non-governmental representatives and leftist political parties with more than 200 protesters on Tuesday to cries of "Tunisia is not for sale".
Egypt and Saudi Arabia have bolstered ties since Sisi took power in 2013 after ousting President Mohamed Mursi of the Muslim Brotherhood, which both countries have banned and designated as a terrorist organization.
Under the title "No to polluting revolutionary Tunisia", Tunisian journalists and 12 civil society organisations held a press conference on Monday at the headquarters of the syndicate, condemning their government for hosting bin Salman, who they held responsible for Khashoggi's death. Flags of Tunisia, Algeria Mauritania, Egypt and Palestine were raised during the protest.