Anybody on the left cannot be trusted to tell the truth about anything. All their claims must be checked out. And even though I immediately distrust what they claim, I check it out anyway.
And the "fact-checkers" on lib news shows or media organs cannot be trusted. Trump will say something that is mostly true, and they'll call it a false claim.
I would say the reverse is true for libs, but many times they, the media, simply ignore what lib pols claim.
It's a mutual admiration society between the media and lib pols. Conservative pols are treated like trash.
Look at Trump's hostile reception at the ABC town hall, whereas Biden was greeted like a deity on his recent CNN interview.