Talking to journalist and writer Bob Woodward, Trump defended bin Salman over the assassination inside a Saudi consulate in Turkey.
"I saved his ass," Trump told Woodward for his upcoming book "Rage," according to an excerpt published on Thursday by Business Insider.
"I was able to get Congress to leave him alone. I was able to get them to stop," Trump said.
Khashoggi, who was a critic of bin Salman, was hacked to death and his body was dismembered at the kingdom’s consulate in Istanbul on October 2, 2018.
A UN report found that there was "sufficient credible evidence" to pin the murder on bin Salman and he should be investigated for it.
The Washington Post, for which he was a columnist, reported in November 2018 that the CIA had concluded that bin Salman had personally ordered his killing by a hit squad at the consulate.
The victim used to criticize bin Salman’s policies, including the deadly war the kingdom is leading against its impoverished southern neighbor Yemen.