Joe Biden's pledges to prevent Iran from getting the bomb and to defend Saudi Arabia from an attack were "music to Saudi Arabia's ears," Bernard Haykel, a professor at Princeton University and confidante of Crown Prince Mohammed Bin Salman tells Ian Bremmer on GZERO World. Biden's controversial trip was largely viewed as a big win for the Saudis, while the US didn't get much out of the discussions because Biden's team didn't do their homework, says Haykel.

The Saudis "were able to show that they have tremendous convening power" by bringing in all the Gulf leaders, thus demonstrating that Riyadh is the most important player there — and the partner you need for political and energy stability.