WATCH: Rep. Elise Stefanik questions Amb. Yovanovitch about Burisma

Rep. Elise Stefanik, R-New York, questioned Marie Yovanovitch, the former U.S. ambassador to Ukraine, on the role of former vice president Joe Biden's son Hunter's role on the board of Burisma, a Ukrainian natural gas company. Stefanik questioned Yovanovitch after Rep. Devin Nunes yielded his time to her. The impeachment probe centers around a July phone call in which Trump asked the president of Ukraine to investigate former vice president and 2020 presidential candidate Joe Biden and his son. Yovanovitch has testified that she was forced out of her position after Trump’s personal lawyer, Rudy Giuliani, engineered a smear campaign against her.