Story highlights The Arizona tarmac meeting between former President Clinton and U.S. attorney general raises questions, writes Paul Callan

Attorney General Loretta Lynch is final authority on whether email probe will result in criminal charges, he notes

Paul Callan is a CNN legal analyst and a former media law professor. He is a former New York City homicide prosecutor and criminal defense attorney who serves as "of counsel" to Edelman & Edelman, PC and is senior trial counsel at CallanLegal, where he focuses on civil rights and wrongful conviction litigation. Follow him on Twitter: @paulcallan The opinions expressed in this commentary are his.

(CNN) The Arizona tarmac meeting between former President Bill Clinton and U.S. Attorney General Loretta Lynch will certainly raise the eyebrows of more than a few law enforcement professionals and voters throughout the United States.

The reason: the AG is the Cabinet officer who is nominally in charge of the FBI's "email server" investigation which in part focuses upon the conduct of former Secretary of State Hillary Clinton.

Since the email server was located in the Clinton's private residence in Chappaqua, N.Y., most members of the public would reasonably assume that Mr. Clinton himself would have more than a passing knowledge regarding the use and maintenance of the server. He would also be intensely interested in keeping his candidate wife clear of any allegations of criminal wrong during her presidential campaign.

Under the circumstances, the tarmac soiree between Clinton and Lynch demonstrates incredibly bad judgment on the part of two seasoned legal and political professionals.

Both should have instantly realized that their private meeting might create public suspicion that something improper must have occurred. After all Donald Trump has been tossing corruption accusations at Hillary Clinton with the frequency of firings on "The Apprentice."

Read More