Bob Woodward reveals what Donald Trump trait gave him ‘a chill’

Veteran journalist Bob Woodward said President Donald Trump’s failure to comprehend why America does certain things abroad in order to keep world peace gave him “a chill.”

“I’ve done this for 47 years and when I learned about that, I got a chill,” the author of tell-all book Fear: Trump in the White House told “Real Time” host Bill Maher on Friday.

RELATED: Claims made in journalist Bob Woodward’s book on Trump’s presidency

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Claims made in journalist Bob Woodward’s book on Trump’s presidency

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Trump reportedly called Attorney General Jeff Sessions a ‘dumb Southerner,’ a ‘traitor’ and ‘mentally retarded,’ according to famed Washington Post journalist Bob Woodward’s book, ‘Fear: Trump in the White House.’ 

(REUTERS/Kevin Lamarque)

According to the book, White House Chief of Staff John Kelly has called President Trump an ‘idiot’ and ‘unhinged’. He also reportedly said ‘this is the worst job I’ve ever had’ and that ‘we’re in Crazytown’.

(OLIVIER DOULIERY/AFP/Getty Images)

Trump wanted Syrian President Bashar al-Assad killed after the April 2017 chemical war attack on civilians. According to Woodward he said, ‘let’s f—ing kill him! Let’s go in. Let’s kill the f—ing lot of them.’

(SANA/Handout via REUTERS)

Defense Secretary Jim Mattis reportedly told Trump they’d follow through on the plan against Assad and then told an aide, ‘we’re not going to do any of that’.

(Chris Kleponis/Pool via Bloomberg)

Trump’s former top economic adviser Gary Cohn allegedly ‘stole a letter off Trump’s desk’ to avoid a potentially disastrous decision on trade.

(REUTERS/Kevin Lamarque)

According to the book, Trump falsely claimed that the late Sen. John McCain used his father’s military rank to get early release from a prisoner-of-war camp in Vietnam.

(Photo by Stephane Cardinale – Corbis/Corbis via Getty Images)

According to the book, Trump told aides that condemning white supremacists and neo-Nazis was the ‘biggest f—-ing mistake’ he’s made following the Charlottesville rally.

(Photo by Chris Kleponis-Pool/Getty Images)

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Woodward also noted how, in his reporting for the book, he realized just how Trump liked “to get power over people, to crush them, to demean them.” He also highlighted the “anxiety and fear” suffered by White House aides who worked closely with the president.

Check out the interview here:

This article originally appeared on HuffPost.