The thing about the border Czar lie that is most instructive is how it exemplifies all the characteristics of the right wing media narrative. It begins with a demonstrable lie that quickly circulates around the conservative media bubble. It is then adopted as part of the narrative without question.
Once adopted, it is impervious to the demonstrable truth proving it to be a lie.
There are dozens of lies now permanently part of the right wing construct with similar origins. Tell the lie, repeat the lie, adopt the lie, refuse to acknowledge it's a lie in the face of the facts.