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

Ex-national security adviser John BoltonJohn BoltonBolton returns to United Against Nuclear Iran as senior adviser Impeachment guide: The 9 witnesses testifying this week The Hill's Morning Report - Week two of public impeachment testimony MORE described President TrumpDonald John TrumpDem senator says Zelensky was 'feeling the pressure' to probe Bidens 2020 Dems slam Trump decision on West Bank settlements Trump calls latest impeachment hearings 'a great day for Republicans' MORE's personal attorney Rudy GiulianiRudy GiulianiDem senator says Zelensky was 'feeling the pressure' to probe Bidens Trump calls latest impeachment hearings 'a great day for Republicans' Five things to know about Tuesday's impeachment hearings 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 Biden2020 Dems slam Trump decision on West Bank settlements Trump calls latest impeachment hearings 'a great day for Republicans' Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul 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 MulvaneyLive coverage: House holds third day of public impeachment hearings Impeachment witness: Ukraine 'gradually came to understand that they were being asked to do something' Impeachment guide: The 9 witnesses testifying this week 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.