I stopped believing anything from that man's mouth in 2015.
Once a person lies to me more than once, I no longer believe anything from their mouth.
trump's lies are constant, stupid and in all cases not necessary. His lies are also deadly.
When lies cause people to be harmed or killed I draw the line. Especially when those lies are self serving and destroys lives, something needs to be done to stop the liar who is doing so much damage.
Fact checking is a good process. It lets people know the facts when a person like trump lies just about every time he opens his mouth.