Donald Trump lashed out at the media on Sunday after more stories describing dysfunction inside his presidential campaign. “If the disgusting and corrupt media covered me honestly and didn’t put false meaning into the words I say, I would be beating Hillary by 20%,” Mr. Trump averred on Twitter.

Mr. Trump is right that most of the media want him to lose, but then that was also true of George W. Bush, George H.W. Bush and Ronald Reagan. It’s true of every Republican presidential nominee. The difference is that Mr. Trump has...