Turkish President Recep Tayyip Erdogan flew to the Argentinian capital Buenos Aires today to take part in the G-20 summit, where he is due to meet with US President Donald Trump and Russian Vladimir Putin. The big question is whether he will respond positively to Saudi Crown Prince Mohammed bin Salman’s request for a meeting, with Turkish Foreign Minister Mevlut Cavusoglu not ruling one out.

It would be the first face-to-face encounter between Erdogan and Saudi Arabia’s de facto ruler since the Oct. 2 murder of Saudi journalist Jamal Khashoggi at the Saudi Consulate in Istanbul.

There is little love lost between the pair, both claiming leadership of the Sunni Muslim world. And Khashoggi’s murder, widely believed to have been ordered by the prince, has allowed Turkey, despite gross human rights violations of its own, to boost Erdogan’s popularity on the Arab street, where the crown prince’s overtures to Israel have triggered contempt.

Yet Ankara’s sustained efforts to rally Trump to its side, sharing secret recordings of Khashoggi’s slaying by 15 Saudi operatives, have not swayed the US president, who continues to stress the United States’ economic interests in preserving ties to the world’s largest oil producer.