Bolton called Giuliani a 'hand grenade' who would blow everyone up: report

Ex-national security adviser John BoltonJohn BoltonTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE described President TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE's personal attorney Rudy GiulianiRudy GiulianiBolton book alleges Trump tied Ukraine aid freeze to Biden investigations: NYT Trump questions why NPR exists after Pompeo clashes with reporter Cotton: Democrats are 'upset that their witnesses haven't said what they want them to say' MORE as a "hand grenade who's going to blow everybody up" in a private conversation with another official who was deposed by congressional committees on Monday as part of the impeachment inquiry.

Bolton made the comment to Fiona Hill, the senior director for Russian and Eurasian affairs, in a July 10 conversation after a separate meeting with Gordon Sondland, the Trump donor who became U.S. ambassador to the European Union, according to a report by The New York Times.

The Times was reporting on Hill's testimony to three committees on Monday, all of which was behind closed doors.

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The remarks attributed to Bolton, who previously worked in the administration of President George W. Bush, highlights the differences within the Trump administration over an effort to pressure Ukraine to investigate former Vice President Joe BidenJoe BidenTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE, a leading candidate for the Democratic presidential nomination in 2020. 

They also highlight tensions within the administration over the activities of Giuliani, the former New York City mayor who appeared to be running a shadow diplomacy effort with Ukraine. 

After a testy exchange with Sondland on July 10, according to the Times, Bolton told Hill to alert White House lawyers about the pressure campaign officials were making on Ukraine to conduct an investigation into Biden.

“I am not part of whatever drug deal Rudy and Mulvaney are cooking up,” Bolton told Hill to tell White House lawyers, according to the testimony reported by the Times. That is a reference to Mick MulvaneyJohn (Mick) Michael MulvaneyFormer senior Senate GOP aide says Republicans should call witnesses Bolton lawyer slams 'corrupted' White House review process after book leak Democrats step up pressure over witnesses after Bolton bombshell MORE, the acting White House chief of staff.

Hill said Bolton told her to contact the chief lawyer for the National Security Council about an effort by Sondland, Giuliani and Mulvaney, according to sources who spoke with the Times.

Hill testified for 10 hours behind closed doors on Monday as part of the impeachment inquiry into Trump.

The inquiry is centered on allegations that Trump asked Ukraine to investigate Biden and his son. 

Sondland is also set to testify to Congress this week behind closed doors.

Bolton resigned as national security adviser in September after numerous differences with Trump. 

Two associates of Giuliani were indicted last week on campaign finance charges related to an effort to get money to U.S. politicians and influence U.S. policy toward Ukraine.