Analyst: Gulf Crisis 'Is a Crisis by Choice, Not by Necessity'

US Secretary of State Rex Tillerson is set to launch a fresh bid on Sunday to ease a crisis between Riyadh and Doha, both allies of Washington, but without high hopes of a breakthrough.

Omar Ashour, a senior lecturer in Middle East Politics and Security Studies at the University of Exeter, speaks to Al Jazeera about Tillerson's Middle East tour.