Stephen Johnson, left, Administrator of the Environmental Pr

UNITED STATES - JULY 26: Stephen Johnson, left, Administrator of the Environmental Protection Agency, waits for a hearing of the Senate Environment and Public Works Committee to begin on Capitol Hill, July 26, 2007, in Washington, D.C. The committee held the hearing on California's request for a waiver from the Environmental Protection Agency to regulate auto emissions to a more stringent standard than required by federal law. (Photo by Brendan Smialowski/Bloomberg via Getty Images)