A retired CIA officer told the Washington Examiner: “From everything we know about the whistleblower and his work in the executive branch then, there is absolutely no doubt he would have been working with Biden when he was vice president.”

As an experienced CIA official on the NSC with the deep knowledge of Ukraine that he demonstrated in his complaint, it is probable that the whistleblower briefed Biden and likely that he accompanied him on Air Force Two during at least one of the six visits the 2020 candidate made to the country.

A former Trump administration official, speaking on condition of anonymity to discuss intelligence matters, said Biden’s work on foreign affairs brought him into close proximity with the whistleblower either at the CIA or when he was detailed to the White House.

“This person, after working with Biden, may feel defensive towards him because he feels [Biden] is being falsely attacked. Maybe he is even talking to Biden’s staff,” the former official said. “Maybe it is innocent, maybe not.”