Donald’s problem is not a lie. The question becomes, can that person be trusted? Donald repeatedly compromises his credibility. This goes back many years.
We expect politician to lie. Donald set a new standard: he always lies and is completely untrustworthy. This is dangerous in finance, trade and diplomacy. (Forget about wife Melania.)
An excellent summary is David Barstow’s “Up is Down: Unreality Show Echoes a History of False Claims,” NY Times, January 29, 2017.