'Trump is a flat-out racist' -- according to Pulitzer-winning journalist who's known him for 30 years
David Cay Johnston (Photo: Screen capture)

Award-winning journalist David Cay Johnston sees through Donald Trump's pledge to "Make America Great Again."

"It's make America white again," he said on Dean Obeidallah's SiriusXM radio show Wednesday.

He claimed to have witnessed Trump discriminate against black, women, Asians and Puerto Ricans over the years.

"The President of the United States is a flat-out racist," Johnston declared.

Johnston also pointed out that Trump has yet to denounce Roseanne Barr for her racist tweets.

Johnston is the author of "Perfectly Legal: The Covert Campaign to Rig Our Tax System to Benefit the Super Rich - and Cheat Everybody Else."