According to reports, McConnell was looking for Republican votes to convict. I took his public announcement that he was going to vote to acquit an announcement to those he’d talked to that he hadn’t found enough.
He might have been willing to be the 67th vote, but he sure didn’t have the guts to be the 58th.
OTOH, the announcement suggests that there might have been a few others in the same position.
In any case, if I know this, Trump knows this. The GQP now has many factions, and Donny’s faction isn’t willing to forgive.