The former Ukrainian head prosecutor alleges he was told to end his investigation into a natural gas company that was linked to former Vice President Joe Biden's son Hunter.

Viktor Shokin made the claim to President Trump's personal attorney Rudy Giuliani during a meeting earlier this year. Some of the details of that conversation were handed over to Congress by the State Department's inspector general on Wednesday, Fox News reported.

Giuliani's notes from that January meeting show that Shokin claimed that his "investigations stopped out of fear of the United States."

“Mr. Shokin attempted to continue the investigations but on or around June or July of 2015, the U.S. Ambassador Geoffrey R. Pyatt told him that the investigation has to be handled with white gloves, which according to Mr. Shokin, that implied do nothing,” the notes from the interview continued.

Biden, while vice president, threatened to withhold U.S. aid to Ukraine if that country did not fire Shokin, who was investigating his son's company. Some have claimed that the U.S. push to get the prosecutor fired were for his own alleged corruption and not related to the younger Biden.