James B. Comey posted on Instagram a photo of seashells arranged to read “86 47,” which could be interpreted as a threat against the 47th president. Comey has since denied that he intended violence; nonetheless the Secret Service is reportedly investigating. This posting may have been a lapse of judgment on Comey’s part or something more nefarious.

Comey’s conduct in this instance, however, fits well with his previous anti-Trump behavior and demonstrably poor judgment. His judgment has been a serious concern for many of us who were proud to serve in the FBI and care about the bureau’s credibility and reputation. In his book and elsewhere, he described the sole origin of the FBI’s counterintelligence investigation of Trump’s first presidential campaign as based on a report “from an allied ambassador” of an encounter in London between a Trump adviser and “a Russian agent.”

That’s Comey’s characterization of George Papadopoulos’ meeting with Joseph Mifsud, a pan-European academic. Mifsud told the then-Trump aide the Russians had “dirt” on Hillary Clinton. Comey has piously huffed that it would have been “dereliction” not to proceed with a counterintelligence investigation based on that report. But to proceed with such an intrusive investigation on so little was an abuse.

A secondhand rumor should never be enough to justify opening a counterintelligence investigation of any American, much less a presidential candidate. This off-handed conversation initiated a counterintelligence case that disrupted Trump’s first term as president. Like directors before him, Comey should have said, “We need more probable cause” before moving forward with an investigation.