Odd that it's a Democrat, according to many on this site, making that assertion.
Yes this is telling!
Trump certainly knows that for much of what he envisions, the Democrat party would be a dead letter. There’s no mileage to be had out of looking like a “union Democrat” if the ultra-liberal high muckety mucks are only going to stab you in the back. Whereas, the GOP is still possible.
Trump has a lot to learn but he isn’t an utter idiot.