President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE slammed veteran journalist Bob Woodward and the release of this upcoming book, "Fear: Trump in the White House," on Friday during a campaign event in Fargo, N.D.

Speaking to supporters, the president lashed out at the Watergate reporter over quotes in the book that Trump claimed were false, and called the entire book a work of "fiction."

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"By the way this idiot Woodward who wrote this book which is all fiction said that I said something like that, but he put it in a very crude manner," Trump said, apparently referring to Woodward's report that the president had insulted Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE, calling him "retarded."

"The concept is true, but the way it was said was very, you know — hey, I went, like, to the best college ... I mean, you read this thing, the quotes were wrong, all these — John Kelly John Francis KellyMORE, Gen. [James] Mattis, they're all writing 'I never said that, I never said that,' " Trump added, referring to denials from top staffers of passages in the book detailing their low opinion of the president's understanding of foreign affairs.

"By the way then this idiot Woodward who wrote this fiction book said I said that, but he put it in a crude manner. The concept is true but the way it was said was very -- hey, I went like to the best college..." Pres. Trump said criticizing the book Bob Woodward's book 'Fear.' pic.twitter.com/VrNDVDCWIs — CBS Evening News (@CBSEveningNews) September 7, 2018

The president's remarks in North Dakota are his latest in a string of condemnations aimed at Woodward's book from both Trump himself and the White House, which has characterized "Fear" as a work of fiction spun by disgruntled ex-employees.

“This book is nothing more than fabricated stories, many by former disgruntled employees, told to make the President look bad," White House press secretary Sarah Huckabee Sanders said in a statement Tuesday.

"Sometimes it is unconventional, but he always gets results," Sanders added. "Democrats and their allies in the media understand the President’s policies are working and with success like this, no one can beat him in 2020 – not even close.”

Publication of the book's excerpts have caused a whirlwind of damaging news stories for the administration, including reports that former economic adviser Gary Cohn Gary David CohnGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Former national economic council director: I agree with 50 percent of House Democrats' HEROES Act MORE removed documents from Trump's desk without the president's knowledge with the goal of preventing Trump from exiting trade deals with Canada, Mexico and South Korea.