One of the most dangerous consequences of this awful period in American life is the denigration of the truth, and of the institutions and people who tell it.
There are two kinds of liars — fools and knaves. Fools lie because they don't know the truth. Knaves lie because they intend to mislead.
Donald Trump is both, because he doesn't even care enough about the truth to find out what it is. He'll say whatever he thinks will get people to believe what he wants them to believe.
What about people like Treasury Secretary Steve Mnuchin, Mr. Trump's point person on the Republican tax bills now making their way through Congress?
Mr. Mnuchin continues to insist that the...