“No that doesn’t make him a liar.”
Well, yeah, when he says flatly that Trump has been a lifelong democrat, he is lying, and he knows he is lying. Trump has never supported a democrat for president; a lifelong democrat always does, by definition. A lifelong democrat does not attend the Republican National Convention, does not support and raise money for Republican presidential candidates, does not question a democrat president’s birth certificate.
Liar’s a bit strong. Exaggerated, hyperbolic possibly, but there’s more than a grain of truth in what he said.