WASHINGTON (AP) — The security chief for the head of the Environmental Protection Agency worked on the side as a private investigator for the owner of a tabloid news company with close ties to President Donald Trump.

EPA special agent Pasquale "Nino" Perrotta performed regular work for National Enquirer publisher American Media Inc. during the 2016 election, according to a person with knowledge of the company's internal workings.

But unlike another private investigator hired by the Enquirer, Perrotta didn't work on such newsroom projects as tracking down sources. Instead, the person told The A...