Speaking with The Mail on Sunday, author of "Fire and Fury: Inside the Trump White House", Michael Wolff, indicated those close to President Donald Trump are not entirely sure what to make of his cognitive deficiencies, tossing around the possibilities of dementia, learning disabilities, or ADHD.
He told the paper: "They discuss it at the White House: his apparent inability to read one page or one paragraph. He can't even follow a PowerPoint.
"They wonder where that is from. ADHD? A learning disability? They thought maybe the guy couldn't read or is semi-literate."
Trump addressed concerns about his mental health that were raised by Wolff's book, tweeting on Saturday that his "two greatest assets have been mental stability and being, like, really smart." He followed up with a press conference, where he noted that he "went to the best colleges for college."
But Wolff stands by his reporting:
In his interview with the Mail on Sunday, Mr Wolff said White House insiders speculated whether Mr Trump had "the early stages of dementia."
"Whether it's lack of sleep, the compounded effects of age… or there's actually some impairment – and that's a possibility – everybody around him discusses that."
The author and journalist added: "Everyone around him says the symptoms have got worse in the year he has been in office – his attention span has lessened, his verbal patterns are more peculiar."