Donald Trump’s first foreign trip as US president was to Saudi Arabia - and this week his Secretary of State Mike Pompeo visited the Kingdom. Despite increased strains on the relationship, including the controversial war in Yemen and the murder of the journalist Jamal Khashoggi, the Trump Administration has shown no signs of breaking with Riyadh. Is this fully explained by the trade in oil and arms – or are other factors at work? How important is a shared antipathy to Iran? Are human rights always expendable when trade and strategic interests are in the mix? And why and how did the two countries become so entwined?

This week Celia Hatton asks a panel of experts what is keeping the United States and Saudi Arabia close.