Donald Trump proposed using a nuclear weapon against North Korea.
The former US president is said to have made the extraordinary suggestion during his first year in office in 2017 and even claimed that the attack could be blamed on another country, a new book has claimed.
Trump had told North Korean dictator Kim Jong-un that any threats to the US would be "met with fire and fury like the world has never seen".
The maverick politician soon doubled down and mockingly referred to Kim as "little rocket man".
However, White House officials led by Trump's chief of staff John Kelly are said to have been concerned about the president's private remarks.
In an afterword to be added to his 2020 book 'Donald Trump v The United States', Michael Schmidt writes: "What scared Kelly even more than the tweets was the fact that behind closed doors in the Oval Office, Trump continued to talk as if he wanted to go to war.
"He cavalierly discussed the idea of using a nuclear weapon against North Korea, saying that if he took such an action, the administration could blame someone else for it to absolve itself of responsibility."
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