Animal rights advocates denounced the Trump administration’s reversal of a ban on animal trophy imports, announced in a memo issued last week, and the secrecy with which President Donald Trump’s U.S. Fish and Wildlife Service (USFWS) will now allow some Americans to import endangered species they have killed in African countries.

The agency said it would begin issuing permits “to import a sport-hunted trophy on a case-by-case basis,” effective immediately, but did not share what guidelines it would follow in making those decisions.

The Center for Biological Diversity objected to the lack of transparency as well as the Trump administration’s refusal to protect elephants, lions, and other animals in African countries including Zimbabwe, Zambia, and Botswana.

The decision comes four months after President Donald Trump announced he would reinstate a 2014 ban on animal trophy imports, calling trophy-hunting a “horror show” despite the abundance of evidence that his sons have hunted animals and posed proudly with their “trophies.”

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