On his Twitter page, Graham wrote that he was inviting Mr. Giuliani to come to the Senate Judiciary Committee to inform on his concerns about widespread corruption in Ukraine.
"I have repeatedly heard alarming accusations from Rudolf Giuliani about corruption in Ukraine, as well as many obscene things about the dismissal of former Prosecutor General Viktor Shokin," Graham wrote.
Democratic Party of the United States reacted at the invitation of the Republican, saying they wanted Giuliani to testify on oath.
Members of the US House of Representatives from the Democratic Party also demanded Trump's lawyer, Rudolf Giuliani, to provide all documents regarding relations with Ukraine.
As we reported earlier, Rudy Giuliani is prepared to testify in the House Intelligence Committee's investigation into the president's impeachment only if his client, Donald Trump, agrees. This was stated by Giuliani in an interview with ABC News.