rooster, People who know Trump well and who are seen as basically honest people are more believable in matters about what he has said, meant, or not said or not meant than those who don't know him as well.
As for any others saying things about any others, people as Trump, Vance and others who use fiction to mislead don't deserve to be seen as credible, in more cases than not.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”