Let’s just start with the sourcing for this story and we’ll get to the claims being made in a moment:
The New York Times interviewed more than a dozen people who speak or interact with the president frequently, including current and former White House aides, campaign advisers, friends and associates. Most spoke on condition of anonymity to candidly discuss internal White House affairs, and to avoid retribution. They would like to see him win again, but say they’re struck by how his demeanor has shifted during this latest dire threat to his presidency.
There are a few named sources including the Mooch: