The Saudis have the financial power to influence anybody they want to.
Not “anybody they want to”. Just anybody that accepts their cash.
It is not a coincidence that The Donald largely self-financed his primary campaign.
But now that he is in, he is actively soliciting money for his general election campaign.
https://secure.donaldjtrump.com/donate/
(Just in case you have an urge and an impulse that needs satisfaction)