Leshchenko has met Giuliani. He also helped spearhead anti-corruption efforts under Poroshenko, who lost reelection this spring to Volodymyr Zelensky, a TV actor turned politician.
"The whole thing is manufactured for Trump's political advantage," said Leshchenko, a former investigative journalist.
Allegations like this are not uncommon in Ukraine. Since gaining independence from the Soviet Union in 1991, the country has struggled to confront corruption and misinformation, said Olexiy Haran, a political scientist at the National University of Kyiv-Mohyla Academy.
No one disputes that Joe Biden wanted Shokin, the prosecutor, fired.
So did many European countries and international organizations. Not only did they believe Shokin undermined attempts to end Ukraine's culture of graft, but his own staff accused him of being corrupt.
"The pressure to remove Shokin did not just come from Biden," said Pavlo Klimkin, Ukraine's minister of foreign affairs in Poroshenko's administration. "The pressure also came from the European Union and others. I know. I was in the meetings about this."