Each case will be judged on its own merits, but this is part of a pattern of selective prosecution.President Donald Trump has embarked on a campaign of prosecuting political foes, from ex-FBI director James Comey to New York Attorney General Letitia James (D). On Thursday night, his former national security adviser, John Bolton, became the third high-profile antagonist to face charges in as many weeks. What’s different now is that the Justice Department’s charges, and the evidence underlying them, appear stronger than in previous cases.A grand jury in Maryland indicted Bolton on 18 counts of transmitting and retaining national defense...