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Giuliani calls Bolton a 'backstabber' over Ukraine allegations

President TrumpDonald John TrumpJudge rules to not release Russia probe documents over Trump tweets Trump and advisers considering firing FBI director after election: WaPo Obama to campaign for Biden in Florida MORE's personal attorney Rudy GiulianiRudy GiulianiGiuliani responds to reports on 'Borat' scene, says he was 'tucking in' his shirt Fort Bragg deletes Twitter account after attributing explicit tweets to hacker Biden: Johnson should be 'ashamed' for suggesting family profited from their name MORE denounced former national security adviser John BoltonJohn BoltonJohn Kelly called Trump 'the most flawed person' he's ever met: report Bolton: North Korea 'more dangerous now' Demand for Trump-related titles sparks expected record year for political books MORE as a "backstabber" in an interview set to broadcast Wednesday.

Giuliani tore into Bolton in the interview with "CBS This Morning" in the wake of reports that Bolton was critical of him and raised concerns about his activities in Ukraine to other administration officials.

"He never said to me, 'I've got a problem with what you are doing in Ukraine,'" Giuliani said. "Never once, never winked, never sent me a little note. He is a personal friend, I thought. So here's the only conclusion I can come to, and it's a harsh one, and I feel very bad about it: He's a backstabber."

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"If your friend was complaining about you behind your back and didn't have the guts to come up to your face and tell you, 'I think you're screwing up' ... that'd be a backstabber," he continued. "That's classic backstabber. So I feel I got a swamp character here."

The New York Times reported Sunday that Bolton wrote in a draft of his forthcoming memoir that Trump said in an August meeting that he did not want to release security aid for Ukraine until the country agreed to investigate his political rivals, a claim that cuts to the heart of the impeachment efforts against Trump.

Bolton also reportedly wrote that he raised concerns to Attorney General William BarrBill BarrTrump and advisers considering firing FBI director after election: WaPo Steele dossier source insists he is not Russian agent: 'It's slander' Voting rights group files suit against Trump, administration officials alleging voter intimidation MORE and Secretary of State Mike PompeoMichael (Mike) Richard PompeoTrump and advisers considering firing FBI director after election: WaPo Brazil's OECD candidacy is best chance for reform Watch live: Pompeo news conference MORE about Giuliani's involvement in Ukraine matters, suggesting to Pompeo that Giuliani may have wanted former U.S. Ambassador to Ukraine Marie YovanovitchMarie YovanovitchGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Strzok: Trump behaving like an authoritarian Powell backs Biden at convention as Democrats rip Trump on security MORE 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.

The reported claims have amplified Democrats' efforts to include witnesses such as Bolton in Trump's ongoing impeachment trial, which GOP leadership has resisted so far.

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Giuliani has been a central character in the impeachment saga. 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 Yovanovitch.

Giuliani and a host of other Trump allies have made a concerted effort to question Bolton's credibility and accuse him of trying to juice book sales with his allegations, which were reported in the middle of Trump's impeachment trial.

Trump has denied he told Bolton security aid for Ukraine was tied to investigations, White House press secretary Stephanie GrishamStephanie GrishamMelania Trump cancels campaign appearance over 'lingering cough' The Memo: Trump grapples with credibility gap in crisis President Trump, Melania Trump test positive for COVID-19 MORE has accused Bolton of selling out national security and a number of Fox News hosts with whom Bolton used to work have decried him as disloyal.