An FBI counterintelligence agent has filed a whistleblower complaint, saying his supervisor told him to stop investigating Rudy Giuliani and to cut off contact with any sources who reported corruption by associates of former President Donald Trump. Via the Insider:

The agent, who served 14 years as a special agent for the bureau, including a long stint in Russia-focused counter-intelligence, claims in a 22-page statement that his bosses interfered with his work in "a highly suspicious suppression of investigations and intelligence-gathering" aimed at protecting "certain politically active figures and possibly also FBI agents" who were connected to Russian and Ukrainian oligarchs.

Those figures, the statement claims, explicitly included "anyone in the [Trump] White House and any former or current associates of President Trump."
...
The agent's reporting on Giuliani wasn't received well in the bureau's New York field office, his statement says. "In the midst of my reporting involving Giuliani, which had previously been identified by my supervisor as 'high impact,' my management told me they received a call from a supervisor in [the New York field office], who they did not identify," the statement says. "This supervisor had taken issue with my reporting."

Sounds like the supervisor he's talking about is Charlie McGonigal, who is now in talks about pleading guilty to working with Russian oligarch Oleg Deripaska while an active FBI official.

So it may have been more than simply working with Deripaska to make money. If true, he could be the person who was suppressing investigations unfavorable to Trump and his circle. This is getting even more interesting.

I'm sure Fox will get right on that story!