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I think it's unusual for the chief of staff to go on a trip, particularly on a trip this long. The chief of staff is usually more of a chief operating officer in the White House itself, and normally when your principal—whether it's the president himself or the head of Cabinet agency—goes abroad, you have his deputy and those folks staying behind to help manage operations in his absence.
Putting the context of [Trump's speech in Saudi Arabia] aside, the imagery is striking: Here is Donald Trump in the birthplace of Islam speaking to Muslim leaders from across the world, and the Koran is bring recited before he gives his address...That's at least somewhat positive in showing that he's going out of his way to address Muslim leaders in a way that's not overly antagonistic.