President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE on Wednesday lashed out at his former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE, calling his upcoming book that reportedly contains details about the Ukraine affair at the center of the president’s impeachment “nasty” and “untrue.”

Trump said that his former top aide “begged” him for a job and that Bolton made “mistakes of judgment” during his tenure, citing an April 2018 television appearance in which Bolton said the Trump administration was considering the “Libya model” for North Korean denuclearization negotiations.

Trump said Bolton was “fired because, frankly, if I listened to him, we would be in World War Six by now.”

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Trump then called into question why Bolton would write a book about his tenure “IMMEDIATELY” after his firing, calling it “nasty & untrue.”

For a guy who couldn’t get approved for the Ambassador to the U.N. years ago, couldn’t get approved for anything since, “begged” me for a non Senate approved job, which I gave him despite many saying “Don’t do it, sir,” takes the job, mistakenly says “Libyan Model” on T.V., and.. — Donald J. Trump (@realDonaldTrump) January 29, 2020

....many more mistakes of judgement, gets fired because frankly, if I listened to him, we would be in World War Six by now, and goes out and IMMEDIATELY writes a nasty & untrue book. All Classified National Security. Who would do this? — Donald J. Trump (@realDonaldTrump) January 29, 2020

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The tweets come days after a report by The New York Times that Bolton wrote in an unpublished draft of his book that Trump told him in August that he wanted to continue to suspend security assistance to Ukraine until the country announced investigations into former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE and his son Hunter Biden.

Trump has repeatedly denied Bolton’s account as reported by the Times, and his allies have lashed out at the former top aide in recent days, questioning his credibility and motives.

The revelations have roiled the Senate impeachment trial, raising pressure on Republicans to support calling Bolton as a witness after the White House prevented him from testifying in the House. The excerpt contradicts a key part of Trump’s defense — namely that he never tied security assistance for Ukraine to investigations, something House impeachment managers have alleged.

Trump’s defense attorneys addressed the issue during their opening arguments on Monday and Tuesday, with the president’s personal attorney Jay Sekulow Jay Alan SekulowNow, we need the election monitors Judge denies Trump's request for a stay on subpoena for tax records Judge throws out Trump effort to block subpoena for tax returns MORE citing Trump's denial and urging senators to disregard the reported details of the manuscript by calling it “inadmissible.”

Harvard law professor Alan Dershowitz Alan Morton DershowitzDershowitz suing CNN for 0 million in defamation suit Bannon and Maxwell cases display DOJ press strategy chutzpah Ghislaine Maxwell attorneys ask for delay to unseal court documents due to 'critical new information' MORE also argued Monday evening that even if Bolton’s reported account were true, the allegations would not rise to the level of an impeachable offense.

Senate Republican leaders are currently scrambling to prevent an affirmative vote on witnesses in the wake of the revelations.

Trump has previously indicated he may try to block Bolton from testifying by asserting executive privilege, saying his testimony would present problems for national security. The president appeared to allude to that in the tweets Wednesday morning by suggesting the content of his forthcoming book is “All Classified National Security.”

Trump tweeted about Bolton, impeachment and the witness issue a handful of times overnight on Tuesday and into Wednesday morning, suggesting the issue is at the forefront of his mind.

“Why didn’t John Bolton complain about this ‘nonsense’ a long time ago, when he was very publicly terminated. He said, not that it matters, NOTHING!” Trump wrote hours before sending the latest tweets attacking Bolton.

Later, Trump also appeared to warn Republican senators against supporting witnesses in the trial, instructing them not to be “played” by Democrats.

“Remember Republicans, the Democrats already had 17 witnesses, we were given NONE! Witnesses are up to the House, not up to the Senate,” the president tweeted. “Don’t let the Dems play you!”

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Why didn’t John Bolton complain about this “nonsense” a long time ago, when he was very publicly terminated. He said, not that it matters, NOTHING! — Donald J. Trump (@realDonaldTrump) January 29, 2020