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During her testimony before House lawmakers on Monday, Fiona Hill, President Trump's former top Russia adviser, said that Rudy Giuliani wanted to see certain things happen in Ukraine in order to benefit Trump, so he went around U.S. officials and career diplomats, a person familiar with the matter told The Washington Post.

Hill met with lawmakers from the three House committees investigating Trump's July 25 phone call with Ukrainian President Volodymyr Zelensky. Throughout her 10-hour, closed-door testimony, she shared her concerns over Giuliani's role in Ukrainian foreign policy, the Post says. Hill was a member of the National Security Council, but left one week before Trump's call with Zelensky.

Hill also reportedly praised Marie Yovanovitch, the former ambassador to Ukraine, and told lawmakers she was angry when Yovanovitch was removed in May, after Giuliani pressured Trump to recall her from the post. Last week, Yovanovitch testified as part of the impeachment inquiry, and said Giuliani and some of his Ukrainian allies saw her as a threat, standing in the way of their political and financial interests.