Has the EPA lost all credibility?

Just a puppet of the US auto industry?

"This is a choice only you can make, but I ask you to think about the history and the future of the agency in making it," stated a memo by a senior career staffer in the EPA to Administrator Stephen Johnson regarding California's tailpipe waiver. "If you are asked to deny this waiver, I fear the credibility of the agency that we both love will be irreparably damaged."

"The eyes of the world are on you. It is obvious to me that there is no legal or technical justification for denying this".

I guess there was only politics. Do US a favor, Mr. Johnson, resign. It is your destiny.