So make your case. Advocate your position. Persuade everyone you see that your position is right, that the demise of humanity is imminent and that we must act immediately to stem climate change. Yes, go for it.
But never by silencing critics, no matter how wrong you are certain they are. This subpoena cannot stand, no matter how strongly, how passionately, you disagree with CEI. There is a line that cannot be crossed, no matter what, and that line has been crossed. Prevail because your ideas are better than theirs, but not because government has the means to bludgeon ideas with which it, and you, disagree.