New Mexico environmental officials are among others in two dozen states pushing back against proposed federal restrictions on emissions from existing power plants. Without state support, the proposed Clean Power Plan won’t reduce carbon dioxide emissions the way the Obama administration hopes it will, according to a new report released by the nonprofit Brookings Institute.

When it comes to clean air, the federal government can set standards, but states decide how to enforce them. New Mexico Environment Department Secretary Ryan Flynn, an attorney, is one of many environment officials across the country who think the rule has problems and may be illegal.

“We agree with the overall goal of the proposed Clean Power Plan,” said department spokeswoman Allison Majure in a statement. “However, we are also extremely concerned about the unprecedented breadth of the proposal.”