The primary work of Trump's candidacy -- and his presidency -- has been
to erode the idea that objective truth exists.
Apparently 40% of Republicans in the gaslighted US disbelieve a White House transcript on Trump's say so.
... he has so conditioned his supporters to believe what he says -- and, as importantly, to reject out-of-hand anything the media reports on -- that actual facts are worthless to them. Even when -- as is the case with the Ukraine call -- the White House is the one providing the facts. [emphasis mine]
Daniel W.'s words from January 2017 are worth revisiting!
Unfortunately that "common goal" isn't as common as it should be! As you point out, a sizable minority of citizens still seem to think the Gaslighter-in-Chief can do no wrong, and that everything he says is gospel. (Even if it contradicts what he said yesterday or last week! Somewhat like an actual well-known religious scripture...)
Many Americans have traded their identity for a red hat.