If Donald Trump thinks something sucks, he'll let you know ... just ask the documentary filmmaker who Trump just called "a loser."
That filmmaker is Mike Tollin, who just made a movie about the brief history of the United States Football League. Trump owned a team in the USFL -- the New Jersey Generals -- until 1985 ... when the whole league tanked.
When Mike finished the film, he sent Trump a copy ... along with a letter that said "I'm guessing you won't love all of it, but I hope you appreciate that I've tried to be fair."
Trump sent the letter back to Tollin -- complete with the following a handwritten message on it:
"Mike ... A third rate documentary -- and extremely dishonest (as you know) -- Best Wishes, Donald Trump ... P.S. You are a loser"