They may not see eye to eye on many issues but, in their different ways, all Gulf Co-operation Council (GCC) members have made themselves useful to Donald Trump, as the US president seeks to tick off his regional policy points ahead of a bid for re-election in November. Trump’s “Deal of the Century” to wrap up to the Israel-Palestine conflict requires key Arab allies, led by Saudi Arabia, to play an expensive leading role; they have paid lip service to the plan despite public reluctance to support arrangements that cannot play well on the street.