I have personal experience with a compulsive liar, #fantasist, shyster, fabulist ... whatever term you prefer. He can tell me it is 3pm and I'll ignore it completely until I see a clock.

It helps to look only, determinedly, solely at what such people DO, not at all what they SAY they're doing..

The correct reporting is:
The President appeared at a press conference and said words.
Not:
The #President said "winkle purtle foo Iran blurk dorb Melania many people say flibbert pling"