the trump administration to grant a visa to a ukrainian official, promising dirt on democrats. manu raju has more. >> reporter: new details about how rudy giuliani used his influence to try to get dirt on joe biden, then later tried to push the federal government to reverse a decision that it had made. now, according to testimony that george kent, a career diplomat, gave to congressional investigators earlier in the week, we are told from four sources familiar with that testimony that kent had actually objected to guiliani's efforts to try to get a visa for victor shulkin, a former ukrainian prosecutor who biden tried to get removed from that post. guiliani wanted to get shulkin a visa. the state department rejected that request. guiliani went around the state department and urged the white house to grant him the visa. now, the visa was never granted. then guiliani carried out subsequent interviews with shulkin via skype.