Until they get state charges, Rudy can rely on a pardon for any convictions

[George] 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.

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.

  CNN

That sounds a little like it's not true that State was working with Giuliani in his efforts.

Concerns that Giuliani was inappropriately involved in shaping and driving the administration's Ukraine policy form a significant part of the intelligence community whistleblower's complaint, which prompted the ongoing impeachment investigation into President Donald Trump.

[...]

In their January 23 Skype interview, Shokin provided information, Giuliani has told CNN, about supposed coordination between Democrats and people in Ukraine, as well as claims about Biden's son Hunter Biden, who had sat on the board of a Ukrainian energy company, Burisma Holdings. Shokin's successor as prosecutor general, Yuriy Lutsenko, did travel to the US and spoke with Giuliani about these claims later.

Details from those interviews were included in a cache of documents Giuliani delivered to the State Department earlier this year, in hopes that the administration would investigate those claims. The State Department inspector general eventually turned the documents over to congressional investigators.

According to a write-up of his interview with Shokin included in the documents, Giuliani claimed that Shokin "believes the current Ambassador Marie L. Yovanovitch denied his visa" and noted that Yovanovitch was "close to Mr. Biden."

Presumably why they wanted her relieved of her job.

...but hey, do what you want...you will anyway.