They better caution him a heck of a lot more forcefully than that.
I would like to see the Republicans come out and say that the "global warming" agenda has been revealed as a multi-billion-dollar fraud; actions to push the agenda before may have been in good faith, but anyone who continues to push the agenda after the Hadley revelations shall be deemed to be complicit in the fraud. Complicity in a multi-billion dollar fraud would in turn be regarded as a "high crime".
The Republicans wouldn't have enough votes to impeach Obama, but if Obama continues to push the agenda and there is an unsuccessful vote to impeach him, those who vote not to impeach Obama may find themselves in trouble in November of 2010.