Kessler says as second-in-command at the FBI in the early 1970s, Felt would have been in the perfect position to leak secrets about President Nixon's Watergate coverup to the Washington Post.

But not everyone's convinced the longtime mystery has been solved. A journalism professor who, with his students, fingered White House insider Fred Fielding as the leak is standing by his findings. Fielding was chief deputy to John Dean, who was chief counsel to President Nixon.

The professor, William Gaines, says a lot of the leaks were information the FBI would not have known. He says it was inside information from the White House.

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