Matt Pawa, an attorney representing plaintiffs in the case, said he and his colleagues expected the White House to stay out of the matter. During a meeting with more than 30 administration lawyers at the solicitor general’s office on June 24, it seemed they had “a lot of friends in the room,” he said.

“We feel stabbed in the back,” Pawa said. “This was really a dastardly move by an administration that said it was a friend of the environment. With friends like this, who needs enemies?”

Top attorneys at environmental advocacy groups are buzzing about the brief, sources say. Some feel betrayed by a White House that has generally been more amenable to environmental regulation than its predecessor.

“This reads as if it were cut and pasted from the Bush administration’s briefing in Massachusetts,” said David Bookbinder, who served as the Sierra Club’s chief climate counsel until his resignation in May.