For what exactly ? If he is a "former aid to the White House", especially on issues if climate, I'd tend to think that he is one of those who "counseled" Dubya on matters of climate. If that is so, then he should be considered as quite ready to give his "expert" opinion once he knows what you want to hear.

Not exactly a stellar reference in any case. Plus, if he's only been doing politics for the past 20 years, then his expertise in the scientific domain is more than put in question.

No man can involve himself in politics for 20 years without compromising with the devil at some point. So, what kind of skeletons does he have, I wonder ?