Some people in Ukraine would really like to have a chat with Donald Trump’s former campaign chair.

Ukrainian prosecutors want to question Paul Manafort in connection with a corruption investigation and have made repeated requests for assistance from US authorities, CNN has learned.

Officials in Ukraine have made multiple attempts to secure U.S. assistance in questioning Manafort, including letters sent to FBI Director James Comey. These requests began in 2014, but haven’t resulted in any testimony from Manafort.

US authorities confirmed to CNN that the requests were received but declined further comment.

Manafort is wanted for his involvement in a case in which Viktor Yanukovych, the pro-Russian candidate whose presidential campaign was guided by Manafort, really did “lock her up.” The her being Ukrainian Prime Minister Yulia Tymoshenko. Manafort’s man Yanukovych helped to frame and jail Tymoshenko in a scheme involving Russian access to Ukrainian oil and gas. 

When the United States became upset over the jailing of Tymoshenko and considered sanctions against Ukraine, Manafort helped draft a plan to secure help from a high-powered law firm in New York City. It’s what that firm did, and the $1 million it was paid, that is the subject of the latest in a series of requests for a few words with Manafort.