"President Bush's decision to go forward with strong environmental legislation, including the Clean Air Act…is a splendid gift to future generations of Americans and Canadians to savor," Brian Mulroney said.
The Trump administration is considering freezing future federal vehicle efficiency standards.
He was confirmed in a 49-47 vote on Thursday.
Over 126 million Americans—about 40 percent—live in areas that fail to meet environmental standards.
One overlooked provision in U.S. law may already give the president all the legal grounds his administration needs