The Trump presidency may now be disintegrating, tumbling toward entropy. By firing James Comey as F.B.I. director, President Trump set in motion the appointment on May 17 evening of Robert Mueller as special counsel. Mueller is a Trump nightmare: a pro who ran the F.B.I. for 12 years and is broadly respected by both parties in Washington for his competence and integrity. If Trump thought he was removing a thorn by firing Comey, he now faces a grove of thistles.

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