Washington (CNN) Former Secretary of State Condoleezza Rice, who has largely remained silent on issues concerning President Donald Trump, said Monday that the President's efforts to get Ukraine to investigate Joe Biden were "out of bounds" and called the administration's shadow foreign policy in Ukraine "deeply troubling."

"The call is murky, it is really murky. I don't like for the President of the United States to mention an American citizen for investigation to a foreign leader. I think that is out of bounds," Rice told CNN's Becky Anderson during a conference in Abu Dhabi, referring to Trump's July 25 phone call with Ukrainian President Volodymyr Zelensky.

"What I see right now troubles me. I see a state of conflict between the foreign policy professionals and someone in Rudy Giuliani who says he was acting on behalf of the President," said Rice, who served under former President George W. Bush.

"But frankly, I don't even know the degree to which that's case. It's troubling. It's deeply troubling."

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