It's a mindset, not an organization. How do you make a mindset a "domestic terrorist"?
Is it because Antifa is against Facism and Authoritarianism? Gee, why would an American president be against a mindset that's anti-Facism and anti-Authoritarianism?
Didn't we fight Facism in WWII? The Cold War? Korea? Vietnam? Venezuela? Don't we topple authoritarian regimes?
How stupid can this administration get? Oh, nevermind. I'll assume they can get more "stupider".