Fiona Hill, the former National Security Council senior director for Europe and Russia, testified Thursday during the impeachment inquiry that former national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE suggested to her that Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE was saying and doing "explosive" things that would "come back to haunt us."

Hill said Bolton described Giuliani as “a hand grenade” who would “blow everyone up,” confirming previous reports about the former national security adviser's comments about President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's personal lawyer. She said that his comments about Giuliani were made in relation to what Hill described as a “smear campaign” launched against former U.S. Ambassador to Ukraine Marie Yovanovitch.

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Asked to clarify what she thought Giuliani meant, Hill said, “I think he meant that obviously what Mr. Giuliani was saying was pretty explosive in any case, he was frequently on television making quite incendiary remarks about everyone involved in this, and that he was clearly pushing forward issues and ideas that would probably come back to haunt us, and in fact that is where we are today."

In response to Hill’s concerns against the attacks on Yovanovitch, she testified that Bolton “looked pained, basically indicated with body language that there was nothing much we could do about it, and he then in the course of that discussion said that Rudy Giuliani was a hand grenade who was going to blow everyone up.”

When Goldman asked her if she understood what Bolton meant by this, Hill said that she did.

Yovanovitch testified last week that she was a subject of a “smear campaign” to force her out of her position as ambassador to Ukraine and that she felt “kneecapped” in her ability to do her job due to this campaign.