FBI leadership is starting an investigation into the origins of the agency’s plan a decade ago to infiltrate the campaign of presidential candidate Donald Trump using two female undercover “honeypot” agents. The off-the-books investigation, launched in 2015 by FBI Director James B. Comey, was revealed by an agency whistleblower in a protected disclosure to the House Judiciary Committee last year and first reported exclusively by The Washington Times in October. In the intelligence community, a honeypot commonly refers to an undercover operative, usually a woman, who feigns sexual or romantic interest to obtain information from a target. The whistleblower said...