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Donald Trump says Seth Meyers is such a hater that it might even be illegal ... ripping into the star in another Truth Social rant.

The President of the United States shared his raw thoughts about "Late Night With Seth Meyers" host Saturday ... calling him perhaps the worst performer ever -- and claiming he sounds like a "deranged lunatic."

He specifically pointed to a bit Meyers did ... mocking a speech DJT gave where he mentioned electric and steam catapults -- and, he said he wasn't impressed by the "Saturday Night Live" alum's jokes.

Trump ended his post with what seems like a threat toward Meyers ... writing, "NO TALENT, NO RATINGS, 100% ANTI TRUMP, WHICH IS PROBABLY ILLEGAL" -- unclear if Trump's just talking here or if he's trying to find a way to bring a case ag

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