(CNN) — Donald Trump's oft-repeated claim that the FBI's investigation of "Crooked Hillary" and the presidential election itself were and are "rigged," seems to have thrown FBI Director James Comey into a state of panic. In foolishly making a public announcement that the bureau is reviewing newly discovered emails related to Hillary Clinton's personal server, he has inserted himself yet again into the presidential campaign.

The FBI virtually never announces the commencement or termination of ongoing criminal investigations or the discovery of new evidence. Such inquiries are often conducted in relative secrecy, enabling a more efficient investigation.

It is not unusual for investigations in so-called "white collar" cases to go on for years, luring the target into an unfounded belief that he or she is in the clear. Then the hammer falls. A grand jury indictment is announced by the Department of Justice and the handcuffs are swiftly employed.

The old, sensible FBI rule book apparently has been thrown on the trash heap this year. While undoubtedly attempting to be open and "transparent," to protect the reputation of the FBI, the FBI director has tossed a Molotov cocktail into the presidential race.

The FBI was now taking "appropriate investigative steps. ... to assess their importance to our investigation." What in the world does this mean? One thing it means is that this issue will move to front and center during the final days of the presidential campaign.

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Voters must now be subjected to endless speculation in the press and explicit accusations from the Trump campaign and other Republican candidates that Hillary Clinton is a "criminal" aided and abetted by a rigged FBI and Justice Department. Comey's "openness and transparency" will blow up in his face and further tarnish the FBI's reputation. He has reinserted the Bureau into the political process.

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