One of Trump’s deficiencies—a constant in the campaign and, so far, in the presidency—was his uncertain grasp of cause and effect. Until now, whatever problems he might have caused in the past had reliably been supplanted by new events, giving him the confidence that one bad story can always be replaced by a better, more dramatic story. He could always change the conversation. The Saudi trip and his bold campaign to upend the old foreign policy world order should have accomplished exactly that. But the president continued to find himself trapped, incredulously on his part, by Comey and
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