Former FBI Director James Comey, you may recall, announced days before the 2016 presidential election that he had "learned of the existence" of the emails on Weiner's laptop .

Weiner is the disgraced husband of Clinton aide Huma Abedin.

Robertson alleges that the manner in which his higher-ups in the FBI handled the case was "not ethically or morally right."

His startling claims are made in a book titled, "October Surprise: How the FBI Tried to Save Itself and Crashed an Election," an excerpt of which has been published by the Washington Post.

Told to Erase Laptop Containing Investigation of Anthony Weiner Laptop

Robertson alleges that the FBI did nothing for a month after discovering Clinton's emails on the Anthony Weiner laptop.

It was only after he spoke with the U.S. Attorney's office overseeing the case, he claims, that the agency took action.