Here's the response:
Keith Olbermann is indeed the person you were thinking of. He's known for his fiery, impassioned critiques of Trump, and his posts on X (formerly Twitter) definitely fit the description you gave. His commentary often comes across with a sense of urgency and intensity, which is why you might describe it as "growling
I was looking forward to seeing a video of him melting down after the election but I guess he's in hiding now. What an asshole.
All the assholes are kinda quiet--trying to regroup and come back with evil plans.