The Wall Street Journal has come under extensive criticism from the White House for a report on Joe Biden’s mental acuity, with spokespersons blasting the story for featuring just one on-the-record Republican source, former House Speaker Kevin McCarthy, to claim that the president is slipping.

On Wednesday morning, Morning Joe added to the chorus, with Joe Scarborough calling it a “Trump hit piece.”

In the piece, McCarthy said, “I used to meet with him when he was vice president. I’d go to his house. He’s not the same person.”

In the piece, McCarthy described speaking to Biden during debt ceiling negotiations in May of last year. McCarthy said that the president was sharp on the phone one day, but the next day, in an in-person meeting, the president “was going back to all the old stuff that had been done for a long time.”

The Journal also reported that more recently,...