Tony Schwartz, the co-author of President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s book “The Art of the Deal,” said in an interview Wednesday that the president is “losing his grip on reality.”

“But what it means in simple terms is he’s losing his grip on reality,” Schwartz told MSNBC’s “The Beat with Ari Melber” when asked about Trump’s reported suggestion that the infamous “Access Hollywood” tape may not be real.

“His reality testing is really poor and I believe that’s exactly what’s going on,” Schwartz added.

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Schwartz described “a dramatic change” in Trump from when he co-authored the book with him to how the president speaks now.

“He is more limited in his vocabulary. He is further from, as I say, this connection to what is factual and real. He is more impulsive. He is more reactive. This is a guy in deep trouble,” said Schwartz.

He also said that many employees at the White House are “hostages to a cult leader.”

“When you watch Sarah Huckabee Sanders right now, you really feel as if you’re watching somebody who is being brainwashed, or has been brainwashed,” Schwartz said, referring to the White House press secretary.