This is from August 2016 and is a fantastic up front article....
"Amid all the self-made myths about Donald Trump, none is more fantastic than Trump the moneymaker, the New York tycoon who has enjoyed a remarkably successful business career. In reality, Mr. Trump was a walking disaster as a businessman for much of his life. This is not just my opinion. Warren Buffett said as much this past week."
Trump, the Bad, Bad Businessman - The New York Times