Giuliani: Bolton sacrificing his integrity 'to make a few bucks on a book'

Rudy GiulianiRudy GiulianiHouse panel says key witness isn't cooperating in probe into Yovanovitch surveillance Pennsylvania Democrat says US Attorney's Office should prioritize opioids rather than 'Russian propaganda' from Giuliani Bill Barr is trying his best to be Trump's Roy Cohn MORE on Monday ripped former national security adviser John BoltonJohn BoltonSchumer on Trump intel shakeup: 'Disgrace,' 'closer to a banana republic' Trump directly sought to block publication of Bolton's book: WaPo 'Parasite' studio fires back after Trump criticism: 'He can't read' MORE as an opportunist after a report on Bolton's forthcoming book said it contained damaging allegations against President TrumpDonald John TrumpWinners and losers from the South Carolina debate Five takeaways from the Democratic debate Democrats duke it out in most negative debate so far MORE and sharp criticism of Giuliani.

Giuliani, who serves as Trump's personal attorney, leapt to the president's defense after The New York Times reported that Bolton wrote in his manuscript of an August meeting in which Trump said he did not want to release security aid for Ukraine until the country agreed to investigate his political rivals.

"There is no way in the world President Trump would say this to John Bolton," Giuliani tweeted. "It’s a shame that a man will sacrifice his integrity to make a few bucks on a book. No wonder he accomplished so little as National Security Advisor."

Trump has denied that he told Bolton that aid for Ukraine was tied to investigations, and the president's allies have raised suspicions about the timing of the report given Bolton's book is due to be released in two months.

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But the report has roiled the impeachment proceedings in the Senate, where Trump and his defense team were hoping for a quick acquittal. The Bolton allegation has led to renewed calls from Democrats to hear Bolton testify.

Giuliani has been a central character in the impeachment saga as well. Multiple current and former administration officials testified last year that the former New York City mayor was conducting a shadow foreign policy in Ukraine to dig up dirt on Democrats, and that he led an effort to oust former Ambassador to Ukraine Marie YovanovitchMarie YovanovitchHouse panel says key witness isn't cooperating in probe into Yovanovitch surveillance President Trump's assault on checks and balances: Five acts in four weeks Former US ambassador Yovanovitch lands a book deal: report MORE.

Bolton reportedly wrote in the manuscript that he raised concerns about Giuliani to other administration officials and suggested that Giuliani may have wanted Yovanovitch removed from her post because she was targeting his private clients as part of an anti-corruption agenda.

Bolton left the White House last September amid tensions with Trump and other staffers.