(CNN) Rudy Giuliani told CNN on Friday that he would not testify for the House of Representatives' impeachment inquiry without consulting his client, President Donald Trump.

Trump's personal lawyer said his work for the President should be protected by attorney-client privilege.

"Ultimately, if I were to say yes and he were to say no, I can't testify," Giuliani said, adding that he has not talked to Trump about the possibility he would testify.

The former New York City mayor has become a central figure in the unfolding scandal surrounding Trump's communications with Ukrainian President Volodymyr Zelensky that have led to a House impeachment inquiry into the President's conduct. According to a White House-released transcript of a July call between the two leaders, Trump asked Zelensky to work with Giuliani and Attorney General William Barr to investigate former Vice President Joe Biden and his son, Hunter, though there is no evidence of wrongdoing by either Joe or Hunter Biden.

Giuliani said he has not heard from any of the three House committees investigating whether Trump acted improperly in his communications with the Ukrainians. Asked if he was concerned he would be subpoenaed by the House, Giuliani laughed.

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