[facedown]

"... to examine how the Saudi's have used their vast wealth to effect US foreign policy..."

I have trouble taking anybody seriously who doesn't know the difference between "affect" and "effect."

Either word would be correct in this sentence.

[Arthur McGowan]

And, of course, the plural of Saudi is Saudis, not Saudi’s.

All it proves is that Stone really needs a proofreader.

[LaRueLaDue]

"... to examine how the Saudi's have used their vast wealth to effect US foreign policy..." I have trouble taking anybody seriously who doesn't know the difference between "affect" and "effect." Either word would be correct in this sentence.

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I was about to say the same thing. It drastically changes the tone and meaning of the sentence, depending on which is used. I doubt the author realized this...