The visit by Saudi Crown Prince Mohammed bin Salman, Deputy Prime Minister and Minister of Defense, to Egypt represents a major boost in relations between the two countries.
The president said last week that he did not believe the CIA's report linking MbS to the murder, a statement cited soon after by the Saudi foreign minister to legitimize claims that the prince was not involved.
He then headed to Bahrain over the weekend and traveled to Egypt on Monday where he held talks with President Abdul Fattah al-Sisi.
"It was premeditated murder", he told the German newspaper, rather than a last resort after they failed to convince him to return to Saudi Arabia.
The journalists' union has hung a banner on its building showing an image of the crown prince holding a bone saw and reading "no to the desecration of Tunisia".
In contrast, Tunisia has since 2011 expanded co-operation with Qatar, with which Saudi Arabia and three other Arab states severed trade and transport ties in June 2017.
In a historic move, the Crown Prince visited the Cathedral of St. Mark in Abbasia, where he met with Pope Tawadros II and church leaders.
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A youth activist group that criticizes Saudi limits on women's rights was among those demonstrating Tuesday.
National security adviser John Bolton also said that the Group of 20 summit "is full to overflowing at this point", referring to meetings with the leaders of Germany, Japan, Argentina, India and South Korea.
Travelling overseas for the first time since the killing, the crown prince is visiting Arab allies before heading to a Group of 20 summit in Argentina this week, where he may face questions about the gruesome slaying.
He stressed that the strategic partnership between the Kingdom of Saudi Arabia (KSA) and Egypt aims to spread love and peace, with a unified vision that serves the interests of the two countries, both official and public.
Protesters shout slogans and hold signs opposing the visit of Saudi Arabia's Crown Prince Mohammed bin Salman in Tunis, Tunisia, November 26, 2018.
Saudi Arabia has repeatedly said the prince had no knowledge of the killing, which Turkey says was carried out at the Saudi consulate by a squad of 15 Saudi agents which included a member of Prince Mohammed's security team. "We don't want the money of a regime whose hands are stained with blood".
The Crown Prince arrived earlier tonight. It read: "No to the pollution of the Tunisian revolution".