“but I’m also aware that he might very well sign almost any piece of legislation that a Democrat-controlled Congress puts in front of him.”
He will sign any legislation that he believes furthers the interests of the American People...FIRST.
That will, in some cases, be contrary to what Republicans like yourself want.
If Chuck Schumer and Nancy Pelosi passed a single-payer health bill on his desk, I’d say the odds are much greater than 50% that he’d sign it. I’d even be willing to bet a lot of money on it.