George Kent, the deputy assistant secretary of state for European and Eurasian affairs, told lawmakers that Giuliani asked the State Department earlier this year to grant Shokin a visa to come to the U.S., which the department declined.
Pretty easy to see the corruption at the State Dept.. If they really wanted to find out what was going on in Ukraine they would want the former prosecutor to come to the USA to give his testimony. It's also easy to see why Trump relies on Giuliani. He can't trust the career state dept employees.