“I shot a Leopard. Super cool, super lucky,” Mr. Fischer wrote. “The Leopard is one of the big 5, as in one of the 5 animals in Africa that will kill you before you can kill it.”

As one of seven commission members, Mr. Fischer — who was originally appointed to the Idaho Fish and Game Commission in 2014 and was reappointed this June — was “responsible for administering the fish and game policy of the state,” according to the department’s website.

Within a few weeks of Mr. Fischer’s email, at least one former Idaho fish and game commissioner, Fred Trevey, replied to him and called for his resignation “sooner rather than later,” according to other emails obtained by The Times. He accused Mr. Fischer of gratuitously sharing photos and descriptions of kills, violating the spirit of responsible hunting.

“I have a difficult time understanding how a person privileged to be an Idaho Fish and Game Commissioner can view such an action as sportsmanlike and an example to others,” Mr. Trevey wrote.

“I’m sure what you did was legal, however, legal does not make it right,” he added.

Another former commissioner wrote to the governor’s office to say he and other former fish and game commissioners objected to the contents of Mr. Fischer’s email.

Namibia places restrictions on when, where and what people can hunt. Trophy hunting season runs from February through November, and hunters must obtain permits, including special permits for large cats, according to the Namibia Professional Hunting Association.

Trophy hunting is also allowed only on properties where hunters have been granted permission by the landowner, the association says.