A federal appeals court on Thursday denied a request by environmental groups to halt wolf hunts that are scheduled to begin next week in Idaho and Montana.

The Ninth Circuit Court of Appeals denied the request by the Alliance for the Wild Rockies and other groups. The groups were seeking to cancel the hunts while the court considers a challenge to congressional action in April that stripped wolves of federal protections in Montana and Idaho, and in parts of Washington, Oregon and Utah.

Earlier this month, U.S. District Judge Donald Molloy in Missoula reluctantly upheld a budget rider that was inserted by Rep. Mike Simpson, R-Idaho, and Sen. Jon Tester, D-Mont. It marked the first time since the passage of the Endangered Species Act in 1973 that Congress forcibly removed protections from a plant or animal.

Molloy ruled that the way Congress went about removing endangered species protections from the Northern Rockies gray wolf undermined the rule of law but did not violate the Constitution. Meanwhile, the environmental groups argued Congress' actions were unconstitutional because they violated the principle of separation of powers.