A veteran FBI agent who blew the whistle on what he saw as political meddling in the bureau’s work was arrested this week by federal authorities while attempting to board an international flight at New York City’s JFK Airport. Jonathan Buma, who had worked for the bureau for 15 years, stands accused of illegally disclosing classified records in his upcoming tell-all book about his career. He drew scrutiny during Trump’s first term for reportedly saying during a presentation that he believed Rudy Giuliani may have been compromised by a Russian counter-influence operation—concerns that were immediately shut down by his superiors....