Saudi Arabia has warned criticism of Crown Prince Mohammed bin Salman is a "red line", after Donald Trump heaped praise on the kingdom. Saudi Foreign Minister Adel al-Jubeir said on Wednesday that calls for the crown prince to be held accountable for the killing of Jamal Khashoggi would not be tolerated.

His comments came as the US president praised Saudi Arabia for keeping oil prices low - one strand of his argument against punishing Riyadh even though the CIA reportedly found strong evidence that the crown prince, the de facto Saudi leader, was involved in the murder.