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4 year oldMr Bolton says Mr Trump wanted China to buy agricultural produce from US farmers, according to details of the forthcoming book previewed by US media.
He also says Mr Trump "remained stunningly uninformed on how to run the White House".
The Trump administration is trying to block the book from going on sale.
Speaking to Fox News, Mr Trump said of Mr Bolton: "He broke the law. This is highly classified information and he did not have approval."
"He was a washed-up guy," the president added. "I gave him a chance."
Wacko John Bolton’s “exceedingly tedious”(New York Times) book is made up of lies & fake stories. Said all good about me, in print, until the day I fired him. A disgruntled boring fool who only wanted to go to war. Never had a clue, was ostracized & happily dumped. What a dope!
— Donald J. Trump (@realDonaldTrump) June 18, 2020
ohn Bolton joined the White House in April 2018 and left in September the following year, saying he had decided to quit. President Trump, however, said he had fired Mr Bolton because he disagreed "strongly" with him.
He is known as a foreign policy hardliner and also served in the administration of President George W Bush. As national security adviser, he was the top counsellor to the US president on security matters at home and abroad.
Mr Bolton's 577-page tome, The Room Where It Happened, is due to go on sale on 23 June.
But on Wednesday night, the Department of Justice sought an emergency order from a judge to stop the book's release.
The publisher, Simon & Schuster, said in a statement: "Tonight's filing by the government is a frivolous, politically motivated exercise in futility."
It said hundreds of thousands of copies of the book had already been distributed around the world and the injunction would accomplish nothing.
Mr Trump's Democratic challenger in this November's election, Joe Biden, said in a statement about the book: "If these accounts are true, it's not only morally repugnant, it's a violation of Donald Trump's sacred duty to the American people."
The allegations refer to a meeting between President Trump and President Xi at the G20 summit in Osaka, Japan, in June last year.
"Trump, stunningly, turned the conversation to the coming US presidential election [in 2020], alluding to China's economic capability and pleading with Xi to ensure he'd win," Mr Bolton wrote.
"He stressed the importance of farmers and increased Chinese purchases of soybeans and wheat in the electoral outcome."
Farmers make up a key voting bloc and largely supported Mr Trump in the 2016 election.
Speaking on Wednesday evening, US Trade Representative Robert Lighthizer disputed Mr Bolton's account, saying the request for help with re-election "never happened".
Mr Bolton also mentions an earlier conversation at the summit's opening dinner, in which they discussed the building of camps in China's western Xinjiang region.
Mr Trump said the construction should go ahead as it was "exactly the right thing to do".
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