Washington (CNN) Career diplomat George Kent told congressional investigators in his closed-door testimony this week that Rudy Giuliani asked the State Department and the White House to grant a visa to the former Ukrainian official who Joe Biden had pushed to have removed when he was vice president, according to four people familiar with Kent's testimony.

Kent, the deputy assistant secretary of state for European and Eurasian affairs, testified that around January 2019 Giuliani requested a visa for former Ukrainian prosecutor-general Viktor Shokin to travel to the United States. Shokin had been pushed out of his position as Ukraine's top prosecutor in 2016 after pressure from Western leaders, including Biden, over concerns that he was not pursuing corruption cases.

Giuliani has previously told CNN he wanted to interview Shokin in person because the Ukrainian promised to reveal dirt on Democrats.

Deputy Assistant Secretary of State George Kent testified before congressional lawmakers on Oct. 15

Kent told congressional investigators the State Department had objected to the request, and State did not grant the visa. Giuliani, Kent said, then appealed to the White House to have State reverse its decision. Rob Blair, a White House aide to acting chief of staff Mick Mulvaney, consulted with State about the decision and sided with the department's rejection of the visa, according to a person familiar.

Shokin's visa was never granted, although Giuliani eventually spoke with Shokin over Skype.

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