Nobody is asking Facebook to ban Trump ads. They are asking Facebook to ban ads with explicit falsehoods.
Trump pretty clearly uses "fake news" as an insult, not a claim of fact.
Contrast with ads with false claims that Facebook has approved, like "Pope endorses Trump" or "Lindsey Graham voted for Green New Deal". No TV network would run those.
> Broadcasters are bound by [Section 315 of the Federal Communications Act of 1934] and therefore can’t reject a presidential candidate’s ad, even if contains false information. (The candidates do have to abide by disclosure rules to make it clear who paid for the ad.)
Trump pretty clearly uses "fake news" as an insult, not a claim of fact.
Contrast with ads with false claims that Facebook has approved, like "Pope endorses Trump" or "Lindsey Graham voted for Green New Deal". No TV network would run those.