This from Forbes is actually a pretty good start. All media outlets should commit to such a policy:
“Trump’s liars don’t merit that same golden parachute. Let it be known to the business world: Hire any of Trump’s fellow fabulists above, and Forbes will assume that everything your company or firm talks about is a lie… Want to ensure the world’s biggest business media brand approaches you as a potential funnel of disinformation? Then hire away.”
Source: A Truth Reckoning: Why We’re Holding Those Who Lied For Trump Accountable